1 | unit uFormMonitor;
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2 |
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3 | interface
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4 |
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5 | uses
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6 | SysUtils, Forms, Classes, Windows, Messages, ExtCtrls, Contnrs, DateUtils;
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7 |
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8 | procedure SetFormMonitoring(activate: boolean);
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9 |
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10 | procedure MarkFormAsStayOnTop(Form: TForm; IsStayOnTop: Boolean);
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11 |
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12 | // Some forms have display tasks when first displayed that are messed up by the
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13 | // form monitor - such as making a combo box automatically drop down. These forms
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14 | // should call FormMonitorBringToFrontEvent, which will be called when the
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15 | // form monitor calls the form's BringToFront method. The Seconds parameter is the
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16 | // amount of time that must transpire before the form monitor will call
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17 | // BringToFront again, unless another form has received focus since the event was called.
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18 |
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19 | procedure FormMonitorBringToFrontEvent(Form: TForm; AEvent: TNotifyEvent; Seconds: integer = 3);
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20 |
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21 | implementation
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22 |
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23 | const
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24 | TIMER_INTERVAL = 8;
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25 | TIMER_CHECKS_BEFORE_TIMEOUT = 1000 div TIMER_INTERVAL;
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26 |
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27 | type
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28 | TFormMonitor = class
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29 | private
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30 | FOldActiveFormChangeEvent: TNotifyEvent;
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31 | FOldActivateEvent: TNotifyEvent;
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32 | FOldRestore: TNotifyEvent;
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33 | FModifyingZOrder: boolean;
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34 | FModifyPending: boolean;
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35 | FActiveForm: TForm;
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36 | FZOrderHandles: TList;
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37 | FLastModal: boolean;
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38 | fTopOnList: TList;
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39 | fTopOffList: TList;
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40 | fTimer: TTimer;
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41 | FTimerCount: integer;
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42 | FMenuPending: boolean;
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43 | FWindowsHook: HHOOK;
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44 | FRunning: boolean;
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45 | FFormEvents: TObjectList;
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46 | FLastActiveFormHandle: HWND;
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47 | procedure ManageForms;
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48 | function FormValid(form: TForm): boolean;
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49 | function HandleValid(handle: HWND): boolean;
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50 | procedure MoveOnTop(Handle: HWND);
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51 | procedure MoveOffTop(Handle: HWND);
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52 | procedure Normalize(Handle: HWND; Yes: boolean);
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53 | procedure NormalizeReset;
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54 | function IsNormalized(Handle: HWND): boolean;
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55 | function GetActiveFormHandle: HWND;
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56 | procedure StartZOrdering;
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57 | function SystemRunning: boolean;
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58 | function ModalDelphiForm: boolean;
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59 | function IsTopMost(Handle: HWND): boolean;
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60 | public
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61 | procedure Start;
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62 | procedure Stop;
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63 | procedure Timer(Sender: TObject);
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64 | procedure Activate(Sender: TObject);
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65 | procedure ActiveFormChange(Sender: TObject);
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66 | procedure Restore(Sender: TObject);
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67 | end;
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68 |
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69 | TFormEvent = class(TObject)
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70 | private
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71 | FForm: TForm;
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72 | FEvent: TNotifyEvent;
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73 | FSeconds: integer;
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74 | FTimeStamp: TDateTime;
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75 | end;
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76 |
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77 | var
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78 | FormMonitor: TFormMonitor = nil;
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79 |
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80 | type
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81 | HDisableGhostProc = procedure(); stdcall;
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82 |
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83 | const
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84 | NORMALIZED = $00000001;
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85 | UN_NORMALIZED = $FFFFFFFE;
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86 | STAY_ON_TOP = $00000002;
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87 | NORMAL_FORM = $FFFFFFFD;
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88 |
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89 |
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90 | procedure DisableGhosting;
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91 | const
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92 | DisableProc = 'DisableProcessWindowsGhosting';
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93 | UserDLL = 'user32.dll';
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94 |
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95 | var
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96 | DisableGhostProc: HDisableGhostProc;
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97 | User32Handle: THandle;
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98 |
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99 | begin
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100 | User32Handle := LoadLibrary(PChar(UserDLL));
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101 | try
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102 | if User32Handle <= HINSTANCE_ERROR then
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103 | User32Handle := 0
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104 | else
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105 | begin
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106 | DisableGhostProc := GetProcAddress(User32Handle, PChar(DisableProc));
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107 | if(assigned(DisableGhostProc)) then
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108 | begin
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109 | DisableGhostProc;
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110 | end;
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111 | end;
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112 | finally
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113 | if(User32Handle <> 0) then
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114 | FreeLibrary(User32Handle);
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115 | end;
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116 | end;
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117 |
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118 | procedure SetFormMonitoring(activate: boolean);
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119 | var
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120 | running: boolean;
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121 | begin
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122 | running := assigned(FormMonitor);
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123 | if(activate <> running) then
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124 | begin
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125 | if(running) then
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126 | begin
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127 | FormMonitor.Stop;
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128 | FormMonitor.Free;
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129 | FormMonitor := nil;
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130 | end
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131 | else
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132 | begin
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133 | FormMonitor := TFormMonitor.Create;
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134 | FormMonitor.Start;
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135 | end;
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136 | end;
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137 | end;
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138 |
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139 | procedure MarkFormAsStayOnTop(Form: TForm; IsStayOnTop: Boolean);
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140 | var
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141 | Data: Longint;
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142 | begin
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143 | Data := GetWindowLong(Form.Handle, GWL_USERDATA);
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144 | if(IsStayOnTop) then
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145 | begin
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146 | Data := Data or STAY_ON_TOP;
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147 | SetWindowPos(Form.Handle, HWND_TOPMOST, 0, 0, 0, 0, SWP_NOMOVE + SWP_NOSIZE);
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148 | end
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149 | else
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150 | begin
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151 | Data := Data and NORMAL_FORM;
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152 | SetWindowPos(Form.Handle, HWND_NOTOPMOST, 0, 0, 0, 0, SWP_NOMOVE + SWP_NOSIZE);
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153 | end;
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154 | SetWindowLong(Form.Handle, GWL_USERDATA, Data);
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155 | end;
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156 |
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157 | function FindFormEventIndex(Form: TForm): integer;
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158 | var
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159 | i: integer;
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160 | event: TFormEvent;
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161 | begin
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162 | Result := -1;
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163 | for i := 0 to FormMonitor.FFormEvents.Count-1 do
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164 | begin
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165 | event := TFormEvent(FormMonitor.FFormEvents[i]);
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166 | if(event.FForm = Form) then
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167 | begin
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168 | Result := i;
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169 | exit;
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170 | end;
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171 | end;
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172 | end;
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173 |
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174 | function FindFormEvent(Form: TForm): TFormEvent;
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175 | var
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176 | idx: integer;
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177 | begin
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178 | idx := FindFormEventIndex(Form);
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179 | if(idx < 0) then
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180 | Result := nil
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181 | else
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182 | Result := TFormEvent(FormMonitor.FFormEvents[idx]);
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183 | end;
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184 |
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185 | procedure FormMonitorBringToFrontEvent(Form: TForm; AEvent: TNotifyEvent; Seconds: integer);
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186 | var
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187 | event: TFormEvent;
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188 | idx: integer;
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189 | begin
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190 | event := FindFormEvent(Form);
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191 | if(assigned(AEvent)) then
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192 | begin
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193 | if(event = nil) then
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194 | begin
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195 | event := TFormEvent.Create;
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196 | event.FForm := Form;
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197 | event.FTimeStamp := 0;
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198 | FormMonitor.FFormEvents.Add(event);
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199 | end;
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200 | event.FEvent := AEvent;
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201 | event.FSeconds := Seconds;
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202 | end
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203 | else
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204 | if(event <> nil) then
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205 | begin
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206 | idx := FindFormEventIndex(Form);
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207 | FormMonitor.FFormEvents.Delete(idx);
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208 | // event.Free; - TObjectList frees object automatically
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209 | end;
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210 | end;
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211 |
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212 | function IsFormStayOnTop(form: TForm): boolean;
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213 | begin
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214 | Result := (form.FormStyle = fsStayOnTop);
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215 | if(not Result) then
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216 | Result := ((GetWindowLong(Form.Handle, GWL_USERDATA) and STAY_ON_TOP) <> 0);
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217 | end;
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218 |
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219 | { TFormMonitor }
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220 |
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221 | procedure TFormMonitor.Activate(Sender: TObject);
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222 | begin
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223 | if(Assigned(FOldActivateEvent)) then
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224 | FOldActivateEvent(Sender);
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225 | NormalizeReset;
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226 | StartZOrdering;
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227 | end;
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228 |
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229 | procedure TFormMonitor.ActiveFormChange(Sender: TObject);
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230 | begin
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231 | if(Assigned(FOldActiveFormChangeEvent)) then
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232 | FOldActiveFormChangeEvent(Sender);
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233 | StartZOrdering;
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234 | end;
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235 |
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236 | procedure TFormMonitor.Restore(Sender: TObject);
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237 | begin
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238 | if(Assigned(FOldRestore)) then
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239 | FOldRestore(Sender);
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240 | NormalizeReset;
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241 | StartZOrdering;
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242 | end;
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243 |
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244 | function TFormMonitor.FormValid(form: TForm): boolean;
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245 | begin
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246 | Result := assigned(form);
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247 | if Result then
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248 | Result := (form.Parent = nil) and (form.ParentWindow = 0) and form.Visible and (form.Handle <> 0);
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249 | end;
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250 |
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251 | function TFormMonitor.HandleValid(handle: HWND): boolean;
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252 | begin
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253 | Result := (handle <> 0);
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254 | if(Result) then
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255 | Result := IsWindow(handle) and IsWindowVisible(handle) and isWindowEnabled(handle);
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256 | end;
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257 |
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258 | function FindWindowZOrder(Window: HWnd; Data: Longint): Bool; stdcall;
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259 | begin
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260 | if(IsWindow(Window) and IsWindowVisible(Window)) then
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261 | FormMonitor.FZOrderHandles.Add(Pointer(Window));
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262 | Result := True;
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263 | end;
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264 |
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265 | procedure TFormMonitor.ManageForms;
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266 | var
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267 | i, j: integer;
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268 | form: TForm;
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269 | formHandle, activeHandle: HWND;
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270 | modal, doCall: boolean;
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271 | event: TFormEvent;
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272 |
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273 | begin
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274 | if(FModifyingZOrder) then exit;
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275 | if(not SystemRunning) then exit;
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276 | FModifyingZOrder := TRUE;
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277 | try
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278 | activeHandle := GetActiveFormHandle;
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279 | modal := ModalDelphiForm;
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280 | FZOrderHandles.Clear;
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281 | fTopOnList.Clear;
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282 | fTopOffList.Clear;
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283 |
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284 | EnumThreadWindows(GetCurrentThreadID, @FindWindowZOrder, 0);
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285 | for i := 0 to FZOrderHandles.Count-1 do
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286 | begin
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287 | formHandle := HWND(FZOrderHandles[i]);
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288 | for j := 0 to Screen.FormCount-1 do
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289 | begin
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290 | form := Screen.Forms[j];
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291 | if(form.Handle = formHandle) then
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292 | begin
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293 | if formValid(form) and (form.Handle <> activeHandle) and IsFormStayOnTop(form) then
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294 | begin
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295 | if(modal and (not IsWindowEnabled(form.Handle))) then
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296 | fTopOffList.Add(Pointer(form.Handle))
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297 | else
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298 | fTopOnList.Add(Pointer(form.Handle));
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299 | end;
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300 | break;
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301 | end;
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302 | end;
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303 | end;
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304 | for i := fTopOffList.Count-1 downto 0 do
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305 | MoveOffTop(HWND(fTopOffList[i]));
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306 | for i := fTopOnList.Count-1 downto 0 do
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307 | MoveOnTop(HWND(fTopOnList[i]));
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308 |
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309 | if(activeHandle <> 0) then
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310 | begin
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311 | if(assigned(FActiveForm)) then
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312 | begin
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313 | event := FindFormEvent(FActiveForm);
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314 | doCall := (event = nil);
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315 | if(not doCall) then
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316 | doCall := (activeHandle <> FLastActiveFormHandle);
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317 | if(not doCall) then
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318 | doCall := SecondsBetween(Now, event.FTimeStamp) > event.FSeconds;
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319 | if(doCall) then
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320 | begin
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321 | if IsFormStayOnTop(FActiveForm) then
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322 | begin
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323 | SetWindowPos(activeHandle, HWND_TOPMOST, 0, 0, 0, 0,
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324 | SWP_NOMOVE or SWP_NOSIZE);
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325 | Normalize(activeHandle, FALSE);
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326 | end;
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327 | FActiveForm.BringToFront;
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328 | if(event <> nil) then
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329 | begin
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330 | if(FormValid(event.FForm)) then
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331 | begin
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332 | event.FEvent(FActiveForm);
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333 | event.FTimeStamp := now;
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334 | end;
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335 | end;
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336 | end;
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337 | end
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338 | else
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339 | begin
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340 | if(activeHandle <> 0) then
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341 | begin
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342 | SetFocus(activeHandle);
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343 | BringWindowToTop(activeHandle);
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344 | if(IsTopMost(activeHandle)) then
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345 | SetWindowPos(activeHandle, HWND_TOPMOST, 0, 0, 0, 0,
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346 | SWP_NOMOVE or SWP_NOSIZE);
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347 | end;
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348 | end;
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349 | end;
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350 | FLastActiveFormHandle := activeHandle;
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351 | finally
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352 | FModifyingZOrder := FALSE;
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353 | end;
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354 | end;
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355 |
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356 | function CallWndHook(Code: Integer; WParam: wParam; Msg: PCWPStruct): Longint; stdcall;
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357 | begin
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358 | case Msg.message of
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359 | WM_INITMENU, WM_INITMENUPOPUP, WM_ENTERMENULOOP:
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360 | FormMonitor.FMenuPending := TRUE;
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361 | WM_MENUSELECT, WM_EXITMENULOOP:
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362 | FormMonitor.FMenuPending := FALSE;
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363 | end;
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364 | Result := CallNextHookEx(FormMonitor.FWindowsHook, Code, WParam, Longint(Msg));
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365 | end;
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366 |
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367 | procedure TFormMonitor.Start;
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368 | begin
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369 | if(FRunning) then exit;
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370 | FRunning := TRUE;
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371 | FTimer := TTimer.Create(Application);
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372 | fTimer.Enabled := FALSE;
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373 | FTimer.OnTimer := Timer;
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374 | FTimer.Interval := TIMER_INTERVAL;
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375 | FMenuPending := FALSE;
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376 | FLastActiveFormHandle := 0;
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377 |
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378 | FZOrderHandles := TList.Create;
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379 | fTopOnList := TList.Create;
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380 | fTopOffList := TList.Create;
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381 | FFormEvents := TObjectList.Create;
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382 | FModifyingZOrder := false;
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383 | FLastModal := false;
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384 | FOldActiveFormChangeEvent := Screen.OnActiveFormChange;
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385 | Screen.OnActiveFormChange := ActiveFormChange;
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386 | FOldActivateEvent := Application.OnActivate;
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387 | Application.OnActivate := Activate;
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388 | FOldRestore := Application.OnRestore;
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389 | Application.OnRestore := Restore;
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390 | FWindowsHook := SetWindowsHookEx(WH_CALLWNDPROC, @CallWndHook, 0, GetCurrentThreadID)
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391 | end;
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392 |
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393 | procedure TFormMonitor.Stop;
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394 | begin
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395 | if(not FRunning) then exit;
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396 | FRunning := FALSE;
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397 | if FWindowsHook <> 0 then
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398 | begin
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399 | UnHookWindowsHookEx(FWindowsHook);
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400 | FWindowsHook := 0;
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401 | end;
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402 | Screen.OnActiveFormChange := FOldActiveFormChangeEvent;
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403 | Application.OnActivate := FOldActivateEvent;
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404 | Application.OnRestore := FOldRestore;
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405 |
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406 | FZOrderHandles.Free;
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407 | fTopOnList.Free;
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408 | fTopOffList.Free;
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409 | FFormEvents.Free;
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410 | fTimer.Enabled := FALSE;
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411 | fTimer.Free;
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412 | end;
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413 |
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414 | procedure TFormMonitor.MoveOffTop(Handle: HWND);
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415 | begin
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416 | if(not IsNormalized(Handle)) then
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417 | begin
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418 | SetWindowPos(Handle, HWND_NOTOPMOST, 0, 0, 0, 0,
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419 | SWP_NOMOVE or SWP_NOSIZE or SWP_NOACTIVATE or SWP_NOOWNERZORDER);
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420 | Normalize(Handle, TRUE);
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421 | end;
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422 | end;
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423 |
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424 | procedure TFormMonitor.MoveOnTop(Handle: HWND);
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425 | begin
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426 | if(isNormalized(Handle)) then
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427 | begin
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428 | SetWindowPos(Handle, HWND_TOPMOST, 0, 0, 0, 0,
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429 | SWP_NOMOVE or SWP_NOSIZE or SWP_NOACTIVATE or SWP_NOOWNERZORDER);
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430 | Normalize(Handle, FALSE);
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431 | end;
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432 | end;
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433 |
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434 | procedure TFormMonitor.Normalize(Handle: HWND; Yes: boolean);
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435 | var
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436 | Data: Longint;
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437 | begin
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438 | Data := GetWindowLong(Handle, GWL_USERDATA);
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439 | if(yes) then
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440 | Data := Data or NORMALIZED
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441 | else
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442 | Data := Data and UN_NORMALIZED;
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443 | SetWindowLong(Handle, GWL_USERDATA, Data);
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444 | end;
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445 |
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446 | function TFormMonitor.IsNormalized(Handle: HWND): boolean;
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447 | begin
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448 | Result := ((GetWindowLong(Handle, GWL_USERDATA) and NORMALIZED) <> 0);
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449 | end;
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450 |
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451 | function TFormMonitor.IsTopMost(Handle: HWND): boolean;
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452 | begin
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453 | Result := ((GetWindowLong(Handle, GWL_EXSTYLE) and WS_EX_TOPMOST) <> 0);
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454 | end;
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455 |
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456 | function FindWindows(Window: HWnd; Data: Longint): Bool; stdcall;
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457 | begin
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458 | FormMonitor.Normalize(Window, FALSE);
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459 | Result := True;
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460 | end;
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461 |
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462 | procedure TFormMonitor.NormalizeReset;
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463 | begin
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464 | EnumThreadWindows(GetCurrentThreadID, @FindWindows, 0);
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465 | end;
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466 |
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467 | var
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468 | uActiveWindowHandle: HWND;
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469 | uActiveWindowCount: integer;
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470 |
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471 | function IsHandleOK(Handle: HWND): boolean;
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472 | var
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473 | i: integer;
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474 |
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475 | begin
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476 | Result := FALSE;
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477 | if(not formMonitor.HandleValid(Handle)) or (Handle = Application.Handle) then exit;
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478 | for i := 0 to Screen.FormCount-1 do
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479 | begin
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480 | if(Handle = Screen.Forms[i].Handle) then exit;
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481 | end;
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482 | Result := TRUE;
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483 | end;
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484 |
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485 | function FindActiveWindow(Window: HWnd; Data: Longint): Bool; stdcall;
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486 | begin
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487 | Result := True;
|
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488 | if(IsHandleOK(Window)) then
|
---|
489 | begin
|
---|
490 | inc(uActiveWindowCount);
|
---|
491 | if(uActiveWindowCount = 1) then
|
---|
492 | uActiveWindowHandle := Window
|
---|
493 | else
|
---|
494 | if(uActiveWindowCount > 1) then
|
---|
495 | Result := false;
|
---|
496 | end;
|
---|
497 | end;
|
---|
498 |
|
---|
499 | function TFormMonitor.GetActiveFormHandle: HWND;
|
---|
500 | var
|
---|
501 | i: integer;
|
---|
502 | form: TForm;
|
---|
503 |
|
---|
504 | begin
|
---|
505 | FActiveForm := Screen.ActiveForm;
|
---|
506 | if(assigned(FActiveForm)) then
|
---|
507 | Result := FActiveForm.Handle
|
---|
508 | else
|
---|
509 | Result := 0;
|
---|
510 | if(FormValid(FActiveForm) and IsWindowEnabled(FActiveForm.Handle)) then
|
---|
511 | exit;
|
---|
512 | for i := 0 to Screen.FormCount-1 do
|
---|
513 | begin
|
---|
514 | form := Screen.Forms[i];
|
---|
515 | if(form.Handle = Result) then
|
---|
516 | begin
|
---|
517 | if FormValid(form) and IsWindowEnabled(form.Handle) then
|
---|
518 | begin
|
---|
519 | FActiveForm := form;
|
---|
520 | Result := form.Handle;
|
---|
521 | exit;
|
---|
522 | end;
|
---|
523 | end;
|
---|
524 | end;
|
---|
525 | FActiveForm := nil;
|
---|
526 | Result := GetActiveWindow;
|
---|
527 | if(IsHandleOK(Result)) then exit;
|
---|
528 | uActiveWindowHandle := 0;
|
---|
529 | uActiveWindowCount := 0;
|
---|
530 | EnumThreadWindows(GetCurrentThreadID, @FindActiveWindow, 0);
|
---|
531 | if(uActiveWindowCount = 1) then
|
---|
532 | begin
|
---|
533 | Result := uActiveWindowHandle;
|
---|
534 | end;
|
---|
535 | end;
|
---|
536 |
|
---|
537 |
|
---|
538 | procedure TFormMonitor.StartZOrdering;
|
---|
539 | begin
|
---|
540 | if(FModifyPending) then exit;
|
---|
541 | if(SystemRunning) then
|
---|
542 | begin
|
---|
543 | FModifyPending := TRUE;
|
---|
544 | FTimerCount := 0;
|
---|
545 | FTimer.Enabled := TRUE;
|
---|
546 | end;
|
---|
547 | end;
|
---|
548 |
|
---|
549 | function TFormMonitor.SystemRunning: boolean;
|
---|
550 | begin
|
---|
551 | Result := assigned(Application.MainForm) and
|
---|
552 | (Application.MainForm.Handle <> 0) and
|
---|
553 | IsWindowVisible(Application.MainForm.Handle);
|
---|
554 | end;
|
---|
555 |
|
---|
556 |
|
---|
557 | function TFormMonitor.ModalDelphiForm: boolean;
|
---|
558 | var
|
---|
559 | i: integer;
|
---|
560 | form: TForm;
|
---|
561 | begin
|
---|
562 | for i := 0 to Screen.FormCount-1 do
|
---|
563 | begin
|
---|
564 | form := screen.Forms[i];
|
---|
565 | if(FormValid(form) and (fsModal in form.FormState)) then
|
---|
566 | begin
|
---|
567 | Result := TRUE;
|
---|
568 | exit;
|
---|
569 | end;
|
---|
570 | end;
|
---|
571 | Result := FALSE;
|
---|
572 | end;
|
---|
573 |
|
---|
574 | procedure TFormMonitor.Timer(Sender: TObject);
|
---|
575 | var
|
---|
576 | NoMenu: boolean;
|
---|
577 | begin
|
---|
578 | inc(FTimerCount);
|
---|
579 | if(FTimerCount > TIMER_CHECKS_BEFORE_TIMEOUT) then
|
---|
580 | begin
|
---|
581 | FTimer.Enabled := FALSE;
|
---|
582 | FMenuPending := FALSE;
|
---|
583 | FModifyPending := FALSE;
|
---|
584 | exit;
|
---|
585 | end;
|
---|
586 | if(FTimerCount <> 1) then exit;
|
---|
587 | FTimer.Enabled := FALSE;
|
---|
588 | NoMenu := not FMenuPending;
|
---|
589 | FMenuPending := FALSE;
|
---|
590 | if(NoMenu and SystemRunning) then
|
---|
591 | ManageForms;
|
---|
592 | FModifyPending := FALSE;
|
---|
593 | end;
|
---|
594 |
|
---|
595 | initialization
|
---|
596 | DisableGhosting;
|
---|
597 |
|
---|
598 | finalization
|
---|
599 |
|
---|
600 | end.
|
---|