summaryrefslogtreecommitdiff
path: root/src/gui/gui_form.pas
blob: 27877bf9c0569fe98feb12cd1575ade56de841da (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
{
    fpGUI  -  Free Pascal GUI Toolkit

    Copyright (C) 2006 - 2008 See the file AUTHORS.txt, included in this
    distribution, for details of the copyright.

    See the file COPYING.modifiedLGPL, included in this distribution,
    for details about redistributing fpGUI.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

    Description:
      Defines a Form control. Also known as a Window which holds other
      controls.
}

unit gui_form;

{$mode objfpc}{$H+}

interface

uses
  Classes,
  SysUtils,
  gfxbase,
  gfx_widget;

type
  TWindowPosition = (wpUser, wpAuto, wpScreenCenter);
  TCloseAction = (caNone, caHide, caFree{, caMinimize});
  
  TFormCloseEvent = procedure(Sender: TObject; var CloseAction: TCloseAction) of object;
  TFormCloseQueryEvent = procedure(Sender: TObject; var CanClose: boolean) of object;

  TfpgBaseForm = class(TfpgWidget)
  private
    FFullScreen: boolean;
    FOnActivate: TNotifyEvent;
    FOnClose: TFormCloseEvent;
    FOnCloseQuery: TFormCloseQueryEvent;
    FOnCreate: TNotifyEvent;
    FOnDeactivate: TNotifyEvent;
    FOnDestroy: TNotifyEvent;
    FOnHide: TNotifyEvent;
    FOnShow: TNotifyEvent;
  protected
    FModalResult: integer;
    FParentForm: TfpgBaseForm;
    FWindowPosition: TWindowPosition;
    FWindowTitle: string;
    FSizeable: boolean;
    procedure   AdjustWindowStyle; override;
    procedure   SetWindowParameters; override;
    procedure   SetWindowTitle(const ATitle: string); override;
    procedure   MsgActivate(var msg: TfpgMessageRec); message FPGM_ACTIVATE;
    procedure   MsgDeActivate(var msg: TfpgMessageRec); message FPGM_DEACTIVATE;
    procedure   MsgClose(var msg: TfpgMessageRec); message FPGM_CLOSE;
    procedure   HandlePaint; override;
    procedure   HandleClose; virtual;
    procedure   HandleHide; override;
    procedure   HandleShow; override;
    procedure   HandleMove(x, y: TfpgCoord); override;
    procedure   HandleResize(awidth, aheight: TfpgCoord); override;
    procedure   HandleKeyPress(var keycode: word; var shiftstate: TShiftState; var consumed: boolean); override;
    procedure   DoOnClose(var CloseAction: TCloseAction); virtual;
    // properties
    property    Sizeable: boolean read FSizeable write FSizeable;
    property    ModalResult: integer read FModalResult write FModalResult;
    property    FullScreen: boolean read FFullScreen write FFullScreen default False;
    property    WindowPosition: TWindowPosition read FWindowPosition write FWindowPosition default wpAuto;
    property    WindowTitle: string read FWindowTitle write SetWindowTitle;
    // events
    property    OnActivate: TNotifyEvent read FOnActivate write FOnActivate;
    property    OnClose: TFormCloseEvent read FOnClose write FOnClose;
    property    OnCloseQuery: TFormCloseQueryEvent read FOnCloseQuery write FOnCloseQuery;
    property    OnCreate: TNotifyEvent read FOnCreate write FOnCreate;
    property    OnDeactivate: TNotifyEvent read FOnDeactivate write FOnDeactivate;
    property    OnDestroy: TNotifyEvent read FOnDestroy write FOnDestroy;
    property    OnHide: TNotifyEvent read FOnHide write FOnHide;
    property    OnShow: TNotifyEvent read FOnShow write FOnShow;
  public
    constructor Create(AOwner: TComponent); override;
    procedure   AfterConstruction; override;
    procedure   BeforeDestruction; override;
    procedure   AfterCreate; virtual;
    procedure   Show;
    procedure   Hide;
    function    ShowModal: integer;
    procedure   Close;
    function    CloseQuery: boolean; virtual;
  end;
  
  
  TfpgForm = class(TfpgBaseForm)
  published
    property    BackgroundColor;
    property    FullScreen;
    property    ModalResult;
    property    Sizeable;
    property    TextColor;
    property    WindowPosition;
    property    WindowTitle;
    property    OnActivate;
    property    OnClose;
    property    OnCloseQuery;
    property    OnCreate;
    property    OnDeactivate;
    property    OnDestroy;
    property    OnHide;
    property    OnPaint;
    property    OnResize;
    property    OnShow;
  end;


function WidgetParentForm(wg: TfpgWidget): TfpgForm;


implementation

uses
  fpgfx,
  gfx_popupwindow,
  gui_menu;
  
type
  // to access protected methods
  TfpgMenuBarFriend = class(TfpgMenuBar)
  end;


function WidgetParentForm(wg: TfpgWidget): TfpgForm;
var
  w: TfpgWidget;
begin
  w := wg;
  while w <> nil do
  begin
    if w is TfpgForm then
    begin
      Result := TfpgForm(w);
      Exit; //==>
    end;
    w := w.Parent;
  end;
  Result := nil;
end;

{ TfpgBaseForm }

procedure TfpgBaseForm.SetWindowTitle(const ATitle: string);
begin
  FWindowTitle := ATitle;
  inherited SetWindowTitle(ATitle);
end;

procedure TfpgBaseForm.MsgActivate(var msg: TfpgMessageRec);
begin
//  writeln('BaseForm - MsgActivate');
  if (fpgApplication.TopModalForm = nil) or (fpgApplication.TopModalForm = self) then
  begin
    FocusRootWidget := self;
    
    if FFormDesigner <> nil then
    begin
      FFormDesigner.Dispatch(msg);
      Exit;
    end;

    if ActiveWidget = nil then
      ActiveWidget := FindFocusWidget(nil, fsdFirst)
    else
      ActiveWidget.SetFocus;
  end;

  if Assigned(FOnActivate) then
    FOnActivate(self);
end;

procedure TfpgBaseForm.MsgDeActivate(var msg: TfpgMessageRec);
begin
  ClosePopups;
  if ActiveWidget <> nil then
    ActiveWidget.KillFocus;
  if Assigned(FOnDeactivate) then
    FOnDeactivate(self);
end;

procedure TfpgBaseForm.HandlePaint;
begin
  inherited HandlePaint;
  Canvas.Clear(FBackgroundColor);
end;

procedure TfpgBaseForm.AdjustWindowStyle;
begin
  if fpgApplication.MainForm = nil then
    fpgApplication.MainForm := self;

  if FWindowPosition = wpAuto then
    Include(FWindowAttributes, waAutoPos)
  else
    Exclude(FWindowAttributes, waAutoPos);

  if FWindowPosition = wpScreenCenter then
    Include(FWindowAttributes, waScreenCenterPos)
  else
    Exclude(FWindowAttributes, waScreenCenterPos);

  if FSizeable then
    Include(FWindowAttributes, waSizeable)
  else
    Exclude(FWindowAttributes, waSizeable);
    
  if FFullScreen then
    Include(FWindowAttributes, waFullScreen)
  else
    Exclude(FWindowAttributes, waFullScreen);
end;

procedure TfpgBaseForm.SetWindowParameters;
begin
  inherited;
  DoSetWindowTitle(FWindowTitle);
end;

constructor TfpgBaseForm.Create(AOwner: TComponent);
begin
  inherited Create(AOwner);
  FWindowPosition  := wpAuto;
  FWindowTitle     := '';
  FSizeable        := True;
  FParentForm      := nil;
  FBackgroundColor := clWindowBackground;
  FTextColor       := clText1;
  FMinWidth        := 32;
  FMinHeight       := 32;
  FModalResult     := 0;
  FFullScreen      := False;
  FIsContainer     := True;
end;

procedure TfpgBaseForm.AfterCreate;
begin
  // for the user
end;

procedure TfpgBaseForm.Show;
begin
  FVisible := True;
  HandleShow;
end;

function TfpgBaseForm.ShowModal: integer;
var
  lCloseAction: TCloseAction;
begin
  FWindowType := wtModalForm;
  fpgApplication.PushModalForm(self);
  ModalResult     := 0;

  Show;

  // processing messages until this form ends.
  // delivering the remaining messages
  fpgApplication.ProcessMessages;
  try
    repeat
      fpgWaitWindowMessage;
    until (ModalResult <> 0) or (not Visible);
  except
    on E: Exception do
    begin
      ModalResult := -1;
      Visible := False;
      fpgApplication.HandleException(self);
    end;
  end;

  fpgApplication.PopModalForm;
  Result := ModalResult;
  
  if ModalResult <> 0 then
  begin
    lCloseAction := caFree; // Dummy variable - we do nothing with it
    DoOnClose(lCloseAction); // Simply so the OnClose event fires.
  end;
end;

procedure TfpgBaseForm.MsgClose(var msg: TfpgMessageRec);
begin
  HandleClose;
end;

procedure TfpgBaseForm.HandleClose;
begin
  Close;
end;

procedure TfpgBaseForm.HandleHide;
begin
  if Assigned(FOnHide) then
    FOnHide(self);
  inherited HandleHide;
end;

procedure TfpgBaseForm.HandleShow;
begin
  inherited HandleShow;
  HandleAlignments(0, 0);
  if Assigned(FOnShow) then
    FOnShow(self);
end;

procedure TfpgBaseForm.HandleMove(x, y: TfpgCoord);
begin
  ClosePopups;
  inherited HandleMove(x, y);
end;

procedure TfpgBaseForm.HandleResize(awidth, aheight: TfpgCoord);
begin
  ClosePopups;
  inherited HandleResize(awidth, aheight);
end;

procedure TfpgBaseForm.HandleKeyPress(var keycode: word;
  var shiftstate: TShiftState; var consumed: boolean);
var
  i: integer;
  wg: TfpgWidget;
begin
//  writeln(Classname, '.Keypress');
  // find the TfpgMenuBar
  if not consumed then
  begin
    for i := 0 to ComponentCount-1 do
    begin
      wg := TfpgWidget(Components[i]);
      if (wg <> nil) and (wg <> self) and (wg is TfpgMenuBar) then
      begin
        TfpgMenuBarFriend(wg).HandleKeyPress(keycode, shiftstate, consumed);
        Break; //==>
      end;
    end;
  end;  { if }

  inherited HandleKeyPress(keycode, shiftstate, consumed);
end;

procedure TfpgBaseForm.AfterConstruction;
begin
  inherited AfterConstruction;
  AfterCreate;
  if Assigned(FOnCreate) then
    FOnCreate(self);
end;

procedure TfpgBaseForm.BeforeDestruction;
begin
  inherited BeforeDestruction;
  if Assigned(FOnDestroy) then
    FOnDestroy(self);
end;

procedure TfpgBaseForm.DoOnClose(var CloseAction: TCloseAction);
begin
  if Assigned(FOnClose) then
    OnClose(self, CloseAction);
end;

procedure TfpgBaseForm.Hide;
begin
  Visible := False;
//  HandleHide;
  if ModalResult = 0 then
    ModalResult := -1;
end;

procedure TfpgBaseForm.Close;
var
  CloseAction: TCloseAction;
  IsMainForm: Boolean;
begin
  if CloseQuery then  // May we close the form? User could override decision
  begin
    IsMainForm := fpgApplication.MainForm = self;
    if IsMainForm then
      CloseAction := caFree
    else
      CloseAction := caHide;

    // execute event handler - maybe user wants to modify it.
    DoOnClose(CloseAction);
    // execute action according to close action
    case CloseAction of
      caHide:
        begin
          Hide;
        end;
        // fpGUI Forms don't have a WindowState property yet!
//      caMinimize: WindowState := wsMinimized;
      caFree:
        begin
          HandleHide;
          if IsMainForm then
            fpgApplication.Terminate
          else
            // We can't free ourselves, somebody else needs to do it
            fpgPostMessage(Self, fpgApplication, FPGM_CLOSE);
        end;
    end;  { case CloseAction }
  end;  { if CloseQuery }
end;

function TfpgBaseForm.CloseQuery: boolean;
begin
  Result := True;
  if Assigned(FOnCloseQuery) then
    FOnCloseQuery(self, Result);
end;


end.