1 | unit VA2006Utils;
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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 | Windows, Messages, SysUtils, Classes, Controls, ComCtrls, CommCtrl,
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7 | Forms;
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8 |
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9 | type
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10 |
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11 | //This class exists to workaround TFrame tabstop set to True
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12 | //Known defect with Delphi 2006: http://qc.embarcadero.com/wc/qcmain.aspx?d=12257
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13 | TfraTabStopFalse = class(TFrame)
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14 | private
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15 | function GetTabStop: Boolean;
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16 | procedure SetTabStop(const Value: Boolean);
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17 | published
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18 | property TabStop: Boolean read GetTabStop write SetTabStop stored False;
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19 | end;
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20 |
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21 | // Fixes bug in Delphi 2006, where clicking on a header control section after
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22 | // any other section have been added or deleted could cause access violations
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23 | procedure FixHeaderControlDelphi2006Bug(HeaderControl: THeaderControl);
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24 |
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25 | implementation
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26 |
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27 | uses
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28 | VAUtils;
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29 |
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30 | type
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31 |
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32 | THeaderControl2006BugFixer = class(TComponent)
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33 | private
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34 | FHeaderControl: THeaderControl;
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35 | procedure HeaderControlMessageHandler(var Msg: TMessage; var Handled: Boolean);
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36 | protected
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37 | procedure Notification(AComponent: TComponent; Operation: TOperation); override;
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38 | public
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39 | constructor CreateWrapper(HeaderControl: THeaderControl);
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40 | end;
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41 |
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42 | procedure THeaderControl2006BugFixer.HeaderControlMessageHandler
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43 | (var Msg: TMessage; var Handled: Boolean);
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44 | var
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45 | OnSectionClick: TSectionNotifyEvent;
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46 | begin
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47 | if (Msg.Msg = CN_NOTIFY) and (PHDNotify(Msg.LParam)^.Hdr.code = HDN_ITEMCLICK) then
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48 | begin
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49 | Handled := TRUE;
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50 | Msg.Result := 0;
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51 | OnSectionClick := FHeaderControl.OnSectionClick;
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52 | if assigned(OnSectionClick) then
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53 | OnSectionClick(FHeaderControl, FHeaderControl.Sections[PHDNotify(Msg.lParam)^.Item]);
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54 | end;
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55 | end;
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56 |
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57 | procedure THeaderControl2006BugFixer.Notification(AComponent: TComponent;
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58 | Operation: TOperation);
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59 | begin
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60 | inherited;
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61 | if (Operation = opRemove) and (AComponent = FHeaderControl) then
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62 | begin
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63 | RemoveMessageHandler(FHeaderControl, HeaderControlMessageHandler);
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64 | Self.Free;
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65 | end;
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66 | end;
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67 |
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68 | constructor THeaderControl2006BugFixer.CreateWrapper(HeaderControl: THeaderControl);
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69 | begin
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70 | inherited Create(nil);
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71 | FHeaderControl := HeaderControl;
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72 | FHeaderControl.FreeNotification(HeaderControl);
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73 | AddMessageHandler(HeaderControl, HeaderControlMessageHandler);
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74 | end;
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75 |
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76 | procedure FixHeaderControlDelphi2006Bug(HeaderControl: THeaderControl);
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77 | begin
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78 | THeaderControl2006BugFixer.CreateWrapper(HeaderControl);
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79 | end;
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80 |
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81 | { TfraTabStopFalse }
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82 |
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83 | function TfraTabStopFalse.GetTabStop: Boolean;
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84 | begin
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85 | Result := False;
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86 | end;
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87 |
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88 | procedure TfraTabStopFalse.SetTabStop(const Value: Boolean);
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89 | begin
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90 | //Do nothing here, just ignore the Value
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91 | end;
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92 |
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93 | end.
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