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|
{
fpGUI - Free Pascal Graphical User Interface
Copyright (C) 2000 - 2001 by
Areca Systems GmbH / Sebastian Guenther
Copyright (C) 2006 by Graeme Geldenhuys
member of the fpGUI development team.
Basic events and Widget class declarations
See the file COPYING.fpGUI, included in this distribution,
for details about the copyright.
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.
**********************************************************************}
{%mainunit fpgui.pp}
{$IFDEF read_interface}
{ Basic events and widget declarations }
// -------------------------------------------------------------------
// Basic event objects
// -------------------------------------------------------------------
{$M+}
{ Basic/Abstract event object which has RTTI enabled. This object does some
kind of reference counting as well. }
TEventObj = class
private
RefCount: LongInt;
FSender: TObject;
public
constructor Create(ASender: TObject);
procedure AddRef;
procedure Release;
function SendToChild(AChild: TWidget): Boolean; virtual;
published
property Sender: TObject read FSender write FSender;
end;
{$M-}
TEventClass = class of TEventObj;
// Miscellaneous events
TLayoutingEventObj = class(TEventObj);
TCalcSizesEventObj = class(TLayoutingEventObj);
TResizedEventObj = class(TLayoutingEventObj)
private
FIsForced: Boolean;
public
constructor Create(ASender: TObject; AIsForced: Boolean);
published
property IsForced: Boolean read FIsForced write FIsForced;
end;
TDestroyEventObj = class(TEventObj);
TEnabledChangeEventObj = class(TEventObj);
TVisibilityChangeEventObj = class(TEventObj);
TPaintingEventObj = class(TEventObj)
private
FCanvas: TFCanvas;
public
constructor Create(ASender: TObject; ACanvas: TFCanvas);
published
property Canvas: TFCanvas read FCanvas write FCanvas;
end;
TPreparePaintEventObj = class(TPaintingEventObj)
public
// To prevent invisible children to be processed:
function SendToChild(AChild: TWidget): Boolean; override;
end;
TPaintEventObj = class(TPaintingEventObj)
public
// To adapt the clipping region and add a translation:
function SendToChild(AChild: TWidget): Boolean; override;
end;
// Mouse events
TMouseEventObj = class(TEventObj)
private
FShift: TShiftState;
FPosition: TPoint;
public
constructor Create(ASender: TObject; AShift: TShiftState; APosition: TPoint);
function SendToChild(AChild: TWidget): Boolean; override;
property Position: TPoint read FPosition write FPosition;
published
property Shift: TShiftState read FShift write FShift;
end;
TMouseButtonEventObj = class(TMouseEventObj)
private
FButton: TMouseButton;
public
constructor Create(ASender: TObject; AButton: TMouseButton;
AShift: TShiftState; APosition: TPoint);
published
property Button: TMouseButton read FButton write FButton;
end;
TMousePressedEventObj = class(TMouseButtonEventObj);
TMouseReleasedEventObj = class(TMouseButtonEventObj);
TMouseMoveEventObj = class(TMouseEventObj)
public
function SendToChild(AChild: TWidget): Boolean; override;
end;
TMouseEnterEventObj = class(TMouseEventObj)
public
NewCursor: TGfxCursor;
end;
TMouseLeaveEventObj = class(TEventObj)
public
function SendToChild(AChild: TWidget): Boolean; override;
end;
TMouseLeaveCheckEventObj = class(TMouseEventObj)
public
function SendToChild(AChild: TWidget): Boolean; override;
NewCursor: TGfxCursor;
end;
TMouseWheelEventObj = class(TMouseEventObj)
private
FWheelDelta: Single;
public
constructor Create(ASender: TObject; AShift: TShiftState;
AWheelDelta: Single; APosition: TPoint);
published
property WheelDelta: Single read FWheelDelta write FWheelDelta;
end;
// -------------------------------------------------------------------
// TWidget
// -------------------------------------------------------------------
TWidgetStyle = set of (wsCaptureMouse, wsClickable, wsOpaque);
TContainerWidget = class;
TWidget = class(TComponent)
private
FParent: TWidget;
FOnClick: TNotifyEvent;
// Property access
procedure SetParent(AParent: TWidget);
function GetBoundsRect: TRect;
function GetLeft: Integer;
function GetTop: Integer;
function GetWidth: Integer;
function GetHeight: Integer;
procedure SetEnabled(AEnabled: Boolean);
procedure SetStyle(const AValue: TStyle);
procedure SetVisible(AVisible: Boolean);
// Event handling
function EvCalcSizes(Event: TCalcSizesEventObj): Boolean;
function EvEnabledChange(Event: TEnabledChangeEventObj): Boolean;
function EvVisibilityChange(Event: TVisibilityChangeEventObj): Boolean;
function EvMousePressed(Event: TMousePressedEventObj): Boolean;
function EvMouseReleased(Event: TMouseReleasedEventObj): Boolean;
function EvMouseEnter(Event: TMouseEnterEventObj): Boolean;
function EvMouseLeave(Event: TMouseLeaveEventObj): Boolean;
function EvMouseLeaveCheck(Event: TMouseLeaveCheckEventObj): Boolean;
protected
FCursor: TGfxCursor;
FText: String;
FStyle: TStyle;
FCanExpandHeight: Boolean;
FCanExpandWidth: Boolean;
FEnabled: Boolean;
FVisible: Boolean;
FOrigin: TPoint;
FBoundsSize: TSize;
FClientRect: TRect;
FMinSize, FMaxSize, FDefSize: TSize;
WidgetStyle: TWidgetStyle;
WidgetState: TWidgetState;
procedure Loaded; override;
procedure Click; dynamic;
procedure Paint(Canvas: TFCanvas); virtual;
procedure SetParentComponent(AParent: TComponent); override;
// Layouting
procedure CalcSizes; virtual; abstract;
procedure Resized; virtual;
// Events
function ProcessEvent(Event: TEventObj): Boolean; virtual;
function DistributeEvent(Event: TEventObj): Boolean; virtual;
procedure EvFocusChanged; dynamic; // Widget got or lost focus
procedure EvKeyPressed(Key: Word; Shift: TShiftState); dynamic;
procedure EvKeyReleased(Key: Word; Shift: TShiftState); dynamic;
procedure EvKeyChar(KeyChar: Char); dynamic;
procedure EvTextChanged; dynamic;
function DoMouseEnter(AShift: TShiftState; AMousePos: TPoint): Boolean;
// Properties
function GetStyle: TStyle;
procedure SetCanExpandWidth(allow: Boolean);
procedure SetCanExpandHeight(allow: Boolean);
procedure SetText(const AText: String); virtual;
property CanExpandWidth: Boolean read FCanExpandWidth write SetCanExpandWidth default False;
property CanExpandHeight: Boolean read FCanExpandHeight write SetCanExpandHeight default False;
property Cursor: TGfxCursor read FCursor write FCursor default crDefault;
property Text: String read FText write SetText;
property OnClick: TNotifyEvent read FOnClick write FOnClick;
public
constructor Create(AOwner: TComponent); override;
destructor Destroy; override;
function SendEvent(Event: TEventObj): Boolean;
function FindForm: TCustomForm;
procedure SetEmbeddedParent(AParent: TWidget);
procedure SetBounds(APosition: TPoint; ASize: TSize);
procedure SetBounds(x, y, w, h: Integer); overload;
function WidgetToClient(const APoint: TPoint): TPoint; virtual;
function ClientToWidget(const APoint: TPoint): TPoint; virtual;
function ClientToScreen(const APoint: TPoint): TPoint; virtual;
procedure Show; dynamic;
procedure Hide; dynamic;
procedure Redraw;
procedure Redraw(const ARect: TRect);
procedure Scroll(const ARect: TRect; DeltaX, DeltaY: Integer);
procedure SetFocus;
procedure Update;
property Parent: TWidget read FParent write SetParent;
property Origin: TPoint read FOrigin;
property BoundsSize: TSize read FBoundsSize;
property BoundsRect: TRect read GetBoundsRect;
property Left: Integer read GetLeft;
property Top: Integer read GetTop;
property Width: Integer read GetWidth;
property Height: Integer read GetHeight;
property MinSize: TSize read FMinSize;
property MaxSize: TSize read FMaxSize;
property DefSize: TSize read FDefSize;
property ClientRect: TRect read FClientRect;
property Style: TStyle read GetStyle write SetStyle;
property Enabled: Boolean read FEnabled write SetEnabled default True;
property Visible: Boolean read FVisible write SetVisible default True;
end;
{$ENDIF read_interface}
{$IFDEF read_implementation}
// -------------------------------------------------------------------
// TEventObj
// -------------------------------------------------------------------
constructor TEventObj.Create(ASender: TObject);
begin
Sender := ASender;
RefCount := 1;
end;
procedure TEventObj.AddRef;
begin
Inc(RefCount);
end;
procedure TEventObj.Release;
begin
ASSERT(RefCount > 0);
Dec(RefCount);
if RefCount = 0 then
Self.Free;
end;
function TEventObj.SendToChild(AChild: TWidget): Boolean;
begin
Inc(RefCount);
Result := AChild.SendEvent(Self);
end;
// -------------------------------------------------------------------
// Miscellaneous events
// -------------------------------------------------------------------
constructor TResizedEventObj.Create(ASender: TObject; AIsForced: Boolean);
begin
inherited Create(ASender);
FIsForced := AIsForced;
end;
function TPreparePaintEventObj.SendToChild(AChild: TWidget): Boolean;
begin
if wsIsVisible in AChild.WidgetState then
Result := inherited SendToChild(AChild)
else
Result := False;
end;
constructor TPaintingEventObj.Create(ASender: TObject; ACanvas: TFCanvas);
begin
inherited Create(ASender);
FCanvas := ACanvas;
end;
function TPaintEventObj.SendToChild(AChild: TWidget): Boolean;
var
ClientPos: TPoint;
begin
if wsIsVisible in AChild.WidgetState then
begin
Canvas.SaveState;
try
if Canvas.IntersectClipRect(AChild.BoundsRect) then
begin
ClientPos := AChild.ClientToWidget(AChild.Origin);
Canvas.AppendTranslation(ClientPos);
Result := inherited SendToChild(AChild);
end else
Result := False;
finally
Canvas.RestoreState;
end;
end else
Result := False;
end;
// -------------------------------------------------------------------
// Mouse events
// -------------------------------------------------------------------
constructor TMouseEventObj.Create(ASender: TObject; AShift: TShiftState;
APosition: TPoint);
begin
inherited Create(ASender);
Shift := AShift;
Position := APosition;
end;
function TMouseEventObj.SendToChild(AChild: TWidget): Boolean;
var
OldPos, ClientPos: TPoint;
begin
if (AChild.WidgetState * [wsEnabled, wsIsVisible] = [wsEnabled, wsIsVisible])
and ((AChild = AChild.FindForm.MouseCaptureWidget) or
PtInRect(AChild.BoundsRect, Position)) then
begin
// Store the old values, as they might get modified during AChild.SendEvent!
OldPos := Position;
ClientPos := AChild.WidgetToClient(Position);
Position := ClientPos - AChild.Origin;
Result := inherited SendToChild(AChild);
Position := OldPos;
end
else
Result := False;
end;
constructor TMouseButtonEventObj.Create(ASender: TObject; AButton: TMouseButton;
AShift: TShiftState; APosition: TPoint);
begin
inherited Create(ASender, AShift, APosition);
Button := AButton;
end;
function TMouseMoveEventObj.SendToChild(AChild: TWidget): Boolean;
begin
if AChild.WidgetState * [wsEnabled, wsIsVisible] = [wsEnabled, wsIsVisible]
then
begin
if PtInRect(AChild.BoundsRect, Position) and not
(wsMouseInside in AChild.WidgetState) then
AChild.DoMouseEnter(Shift, Position - AChild.Origin);
Result := inherited SendToChild(AChild);
end else
Result := False;
end;
function TMouseLeaveEventObj.SendToChild(AChild: TWidget): Boolean;
begin
if wsMouseInside in AChild.WidgetState then
Result := inherited SendToChild(AChild)
else
Result := False;
end;
function TMouseLeaveCheckEventObj.SendToChild(AChild: TWidget): Boolean;
begin
(* if AChild = AChild.FindForm.MouseCaptureWidget then
WriteLn('CapturedWidget: Leave check for ', MouseX, ' / ', MouseY);
if {(AChild <> AChild.FindForm.MouseCaptureWidget) and}
((MouseX < AChild.Left) or (MouseY < AChild.Top) or
(MouseX >= AChild.Left + AChild.Width) or
(MouseY >= AChild.Top + AChild.Height)) and
(wsMouseInside in AChild.WidgetState) then
AChild.SendEvent(TMouseLeaveEventObj.Create(Self));
*)
Result := inherited SendToChild(AChild);
end;
constructor TMouseWheelEventObj.Create(ASender: TObject; AShift: TShiftState;
AWheelDelta: Single; APosition: TPoint);
begin
inherited Create(ASender, AShift, APosition);
WheelDelta := AWheelDelta;
end;
// ===================================================================
// TWidget
// ===================================================================
constructor TWidget.Create(AOwner: TComponent);
begin
inherited Create(AOwner);
WidgetState := [wsEnabled];
FCanExpandWidth := False;
FCanExpandHeight := False;
FEnabled := True;
FVisible := True;
end;
destructor TWidget.Destroy;
begin
inherited Destroy;
end;
function TWidget.SendEvent(Event: TEventObj): Boolean;
{$IFDEF TraceEvents}
var
i: Integer;
{$ENDIF}
begin
{$IFDEF TraceEvents}
for i := 1 to EventNestingLevel do
Write(' ');
WriteLn(Event.ClassName, ' event for ', Name, ':', ClassName);
Inc(EventNestingLevel);
{$ENDIF}
Result := ProcessEvent(Event);
{$IFDEF TraceEvents}
Dec(EventNestingLevel);
for i := 1 to EventNestingLevel do
Write(' ');
if Result then
WriteLn(Event.ClassName, ' event has been blocked.');
{$ENDIF}
Event.Release;
end;
function TWidget.FindForm: TCustomForm;
var
Widget: TWidget;
begin
Widget := Self;
while not (Widget is TCustomForm) do
begin
Widget := Widget.Parent;
if not Assigned(Widget) then
begin
Result := nil;
exit;
end;
end;
Result := TCustomForm(Widget);
end;
procedure TWidget.SetEmbeddedParent(AParent: TWidget);
begin
FParent := AParent;
end;
procedure TWidget.SetBounds(APosition: TPoint; ASize: TSize);
begin
LAYOUTTRACE('TWidget.SetBounds for %s:%s. Old size: %dx%d, new size: %dx%d',
[Name, ClassName, BoundsSize.cx, BoundsSize.cy, ASize.cx, ASize.cy]);
FOrigin := APosition;
if ASize <> BoundsSize then
begin
FBoundsSize := ASize;
FClientRect := Rect(0, 0, BoundsSize.cx, BoundsSize.cy);
SendEvent(TResizedEventObj.Create(Self, wsSizeIsForced in WidgetState));
end;
end;
procedure TWidget.SetBounds(x, y, w, h: Integer);
begin
SetBounds(Point(x, y), Size(w, h));
end;
function TWidget.WidgetToClient(const APoint: TPoint): TPoint;
begin
// as default, the outer rectangle is identical to the client rectangle
Result := APoint;
end;
function TWidget.ClientToWidget(const APoint: TPoint): TPoint;
begin
// as default, the outer rectangle is identical to the client rectangle
Result := APoint;
end;
function TWidget.ClientToScreen(const APoint: TPoint): TPoint;
begin
Result := APoint + Origin;
Result := ClientToWidget(Result);
if Assigned(Parent) then
Result := Parent.ClientToScreen(Result);
end;
{procedure TWidget.Update;
begin
LAYOUTTRACE('TWidget.Update for %s:%s', [Name, ClassName]);
if wsIsUpdating in WidgetState then
exit;
Include(WidgetState, wsIsUpdating);
SendEvent(TUpdateEventObj.Create(Self));
Exclude(WidgetState, wsIsUpdating);
end;
procedure TWidget.RecalcLayout;
var
OldW, OldH: Integer;
x, y: Integer;
Widget: TWidget;
begin
if (csLoading in ComponentState) or (not Visible) then
exit;
LAYOUTTRACE('TWidget.RecalcLayout for %s:%s', [Name, ClassName]);
OldW := Width;
OldH := Height;
MinW := 0;
MinH := 0;
DefW := 0;
DefH := 0;
MaxW := InfiniteSize;
MaxH := InfiniteSize;
EvRecalcLayout;
if MinW = 0 then MinW := 1;
if MinH = 0 then MinH := 1;
if DefW < MinW then DefW := MinW;
if DefH < MinH then DefH := MinH;
if (not FCanExpandWidth) or (MaxW < DefW) then
MaxW := DefW;
if (not FCanExpandHeight) or (MaxH < DefH) then
MaxH := DefH;
if (DefW < OldW) or (DefH < OldH) or ((not (wsOpaque in WidgetStyle)) and
((DefW > OldW) or (DefH > OldH))) then
begin
x := 0;
y := 0;
Widget := Self;
while not (Widget is TCustomForm) do
begin
Inc(x, Widget.Left);
Inc(y, Widget.Top);
Widget := Widget.parent;
end;
TCustomForm(Widget).Wnd.Invalidate(Rect(x, y,
x + Max(Width, OldW), y + Max(Height, OldH)));
end;
if Assigned(Parent) and not (wsIsUpdating in Parent.WidgetState) then
Parent.RecalcLayout;
end;}
procedure TWidget.Show;
begin
if not Visible then
begin
LAYOUTTRACE('TWidget.Show for %s:%s', [Name, ClassName]);
FVisible := True;
if Assigned(Parent) and (wsIsVisible in Parent.WidgetState) then
begin
SendEvent(TVisibilityChangeEventObj.Create(Self));
Parent.Update;
end;
end;
end;
procedure TWidget.Hide;
begin
if Visible then
begin
LAYOUTTRACE('TWidget.Hide for %s:%s', [Name, ClassName]);
FVisible := False;
if wsIsVisible in WidgetState then
begin
SendEvent(TVisibilityChangeEventObj.Create(Self));
if Assigned(Parent) then
Parent.Update;
end;
end;
end;
procedure TWidget.Redraw;
begin
Redraw(Rect(0, 0, BoundsSize.cx, BoundsSize.cy));
end;
procedure TWidget.Redraw(const ARect: TRect);
var
x, y: Integer;
Form: TCustomForm;
WidgetPos, FormPos: TPoint;
begin
if not (wsIsVisible in WidgetState) then
exit;
Form := FindForm;
WidgetPos := ClientToScreen(Point(0, 0));
FormPos := Form.ClientToScreen(Point(0, 0));
x := ARect.Left + WidgetPos.x - FormPos.x;
y := ARect.Top + WidgetPos.y - FormPos.y;
Form.Wnd.Invalidate(
Rect(x, y, x + ARect.Right - ARect.Left, y + ARect.Bottom - ARect.Top));
end;
procedure TWidget.Scroll(const ARect: TRect; DeltaX, DeltaY: Integer);
var
r, ClipRect: TRect;
Widget: TWidget;
Form: TCustomForm;
Canvas: TFCanvas;
begin
if not (wsIsVisible in WidgetState) then
exit;
Form := FindForm;
{ !!!: Better do real DirtyList correction, which might improve performance
a lot in some situations }
Form.Wnd.PaintInvalidRegion;
r.Left := ARect.Left;
r.Top := ARect.Top;
Widget := Self;
Canvas := TFCanvas(Form.Wnd.Canvas);
Canvas.SaveState;
try
while Widget <> Form do
begin
ClipRect.TopLeft := Form.WidgetCoords(Widget);
ClipRect.BottomRight := ClipRect.TopLeft + Widget.BoundsSize;
Canvas.IntersectClipRect(ClipRect);
r.TopLeft := r.TopLeft + Widget.Origin +
Widget.ClientToWidget(Point(0, 0));
Widget := Widget.Parent;
end;
r.Right := r.Left + ARect.Right - ARect.Left;
r.Bottom := r.Top + ARect.Bottom - ARect.Top;
ClipRect := Canvas.GetClipRect;
{ Perform a quick clipping against the ClipRect - this might reduce
the number of pixels which get copied }
if r.Left < ClipRect.Left then
r.Left := ClipRect.Left;
if r.Left + DeltaX < ClipRect.Left then
r.Left := ClipRect.Left - DeltaX;
if r.Top < ClipRect.Top then
r.Top := ClipRect.Top;
if r.Top + DeltaY < ClipRect.Top then
r.Top := ClipRect.Top - DeltaY;
if r.Right > ClipRect.Right then
r.Right := ClipRect.Right;
if r.Right + DeltaX > ClipRect.Right then
r.Right := ClipRect.Right - DeltaX;
if r.Bottom > ClipRect.Bottom then
r.Bottom := ClipRect.Bottom;
if r.Bottom + DeltaY > ClipRect.Bottom then
r.Bottom := ClipRect.Bottom - DeltaY;
Canvas.CopyRect(Canvas, r, r.TopLeft + Point(DeltaX, DeltaY));
finally
Canvas.RestoreState;
end;
// Redraw the areas which has been scrolled in
with Form.WidgetCoords(Self) do
begin
Dec(ClipRect.Left, x);
Dec(ClipRect.Top, y);
Dec(ClipRect.Right, x);
Dec(ClipRect.Bottom, y);
end;
if DeltaX <> 0 then
begin
r := ARect;
if DeltaX < 0 then // Scrolling to the left size
begin
r.Left := r.Right + DeltaX;
if r.Right > ClipRect.Right then
begin
Dec(r.Left, r.Right - ClipRect.Right);
r.Right := ClipRect.Right;
end;
end else // Scrolling to the right size
begin
r.Right := r.Left + DeltaX;
if r.Left < ClipRect.Left then
begin
Inc(r.Right, ClipRect.Left - r.Left);
r.Left := ClipRect.Left;
end;
end;
Redraw(r);
end;
if DeltaY <> 0 then
begin
r := ARect;
if DeltaY < 0 then // Scrolling upwards
begin
r.Top := r.Bottom + DeltaY;
if r.Bottom > ClipRect.Bottom then
begin
Dec(r.Top, r.Bottom - ClipRect.Bottom);
r.Bottom := ClipRect.Bottom;
end;
end else // Scrolling downwards
begin
r.Bottom := r.Top + DeltaY;
if r.Top < ClipRect.Top then
begin
Inc(r.Bottom, ClipRect.Top - r.Top);
r.Top := ClipRect.Top;
end;
end;
Redraw(r);
end;
end;
procedure TWidget.SetFocus;
begin
FindForm.FocusedWidget := Self;
end;
procedure TWidget.Update;
var
PropagateUpdate: Boolean;
OldMinSize, OldMaxSize, OldDefSize: TSize;
begin
if not (wsIsVisible in WidgetState) then
exit;
if wsSizeIsForced in WidgetState then
PropagateUpdate := True
else
begin
OldMinSize := MinSize;
OldMaxSize := MaxSize;
OldDefSize := DefSize;
SendEvent(TCalcSizesEventObj.Create(Self));
PropagateUpdate := (OldMinSize <> MinSize) or (OldMaxSize <> MaxSize) or
(OldDefSize <> DefSize);
end;
if PropagateUpdate and Assigned(Parent) then
Parent.Update
else
SendEvent(TResizedEventObj.Create(Self, wsSizeIsForced in WidgetState));
end;
procedure TWidget.Loaded;
begin
inherited Loaded;
{!!!: if not (wsEnabled in WidgetState) then
UpdateEnabledState;}
end;
procedure TWidget.Click;
begin
Redraw;
if Assigned(OnClick) then
OnClick(Self);
end;
procedure TWidget.Paint(Canvas: TFCanvas);
begin
// Do nothing here.
end;
procedure TWidget.SetParentComponent(AParent: TComponent);
begin
if AParent is TContainerWidget then
SetParent(TContainerWidget(AParent));
end;
procedure TWidget.SetEnabled(AEnabled: Boolean);
begin
if AEnabled <> Enabled then
begin
FEnabled := AEnabled;
SendEvent(TEnabledChangeEventObj.Create(Self));
end;
end;
procedure TWidget.SetStyle(const AValue: TStyle);
begin
FStyle := AValue;
end;
procedure TWidget.SetVisible(AVisible: Boolean);
begin
if AVisible then
Show
else
Hide;
end;
procedure TWidget.Resized;
begin
// Do nothing by default
end;
procedure TWidget.EvFocusChanged;
begin
Redraw;
end;
procedure TWidget.EvKeyPressed(Key: Word; Shift: TShiftState);
function SetFocusIfPossible(Widget: TWidget): Boolean;
begin
Result := (wsClickable in Widget.WidgetStyle) and
(wsEnabled in Widget.WidgetState);
if Result then
Widget.SetFocus;
end;
function FocusFirst(Widget: TWidget): Boolean;
var
i: Integer;
Child: TWidget;
begin
Result := False;
if not Widget.InheritsFrom(TContainerWidget) then
exit;
for i := 0 to TContainerWidget(Widget).ChildCount - 1 do
begin
Child := TContainerWidget(Widget).Children[i];
if SetFocusIfPossible(Child) or FocusFirst(Child) then
begin
Result := True;
exit;
end;
end;
end;
function FocusLast(Widget: TWidget): Boolean;
var
i: Integer;
Child: TWidget;
begin
Result := False;
if not Widget.InheritsFrom(TContainerWidget) then
exit;
for i := TContainerWidget(Widget).ChildCount - 1 downto 0 do
begin
Child := TContainerWidget(Widget).Children[i];
if SetFocusIfPossible(Child) or FocusLast(Child) then
begin
Result := True;
exit;
end;
end;
end;
var
mshift: TShiftState;
i, j: Integer;
CurWidget: TWidget;
CurParent: TContainerWidget;
begin
// Handle focus movement keys
mshift := Shift * [ssShift, ssAlt, ssCtrl, ssMeta, ssSuper, ssHyper, ssAltGr];
if ((mshift = []) and ((Key = keyLeft) or (Key = keyUp))) or
((mshift = [ssShift]) and (Key = keyTab)) then
begin
if Assigned(Parent) then
begin
CurWidget := Self;
CurParent := TContainerWidget(Parent);
while Assigned(CurParent) and CurParent.InheritsFrom(TContainerWidget) do
begin
for i := CurParent.ChildCount - 1 downto 1 do
begin
if CurParent.Children[i] = CurWidget then
begin
j := i - 1;
//Dec(i);
while j >= 0 do
begin
if SetFocusIfPossible(CurParent.Children[j]) or
FocusLast(CurParent.Children[j]) then
exit;
Dec(j);
end;
break;
end; { if }
end; { for }
CurParent := TContainerWidget(CurParent.Parent);
end; { while }
end
else
begin
if FocusLast(Self) then
exit;
end;
end
else
begin
if (mshift = []) and
((Key = keyRight) or (Key = keyDown) or (Key = keyTab)) then
begin
if Assigned(Parent) then
begin
CurWidget := Self;
CurParent := TContainerWidget(Parent);
while Assigned(CurParent) and CurParent.InheritsFrom(TContainerWidget) do
begin
for i := 0 to CurParent.ChildCount - 2 do
begin
if CurParent.Children[i] = CurWidget then
begin
j := i;
Inc(j);
while j < CurParent.ChildCount do
begin
if SetFocusIfPossible(CurParent.Children[j]) or
FocusFirst(CurParent.Children[j]) then
exit;
Inc(j);
end;
break;
end; { if }
end; { for }
CurParent := TContainerWidget(CurParent.Parent);
end; { while }
end
else
begin
if FocusFirst(Self) then
exit;
end;
end
else if (Key = Ord(' ')) and (wsClickable in WidgetStyle) then
begin
Click;
exit;
end;
end;
if Assigned(Parent) then
Parent.EvKeyPressed(Key, Shift);
end;
procedure TWidget.EvKeyReleased(Key: Word; Shift: TShiftState);
begin
if Assigned(Parent) then
Parent.EvKeyReleased(Key, Shift);
end;
procedure TWidget.EvKeyChar(KeyChar: Char);
begin
if Assigned(Parent) then
Parent.EvKeyChar(KeyChar);
end;
procedure TWidget.EvTextChanged;
begin
Update;
Redraw;
end;
function TWidget.DoMouseEnter(AShift: TShiftState; AMousePos: TPoint): Boolean;
var
Event: TMouseEnterEventObj;
begin
Event := TMouseEnterEventObj.Create(Self, AShift, AMousePos);
Event.AddRef;
Result := SendEvent(Event);
if Event.NewCursor <> crDefault then
FindForm.Wnd.Cursor := Event.NewCursor;
Event.Free;
end;
function TWidget.GetStyle: TStyle;
var
Widget: TWidget;
begin
if Assigned(FStyle) then
Result := FStyle
else
begin
ASSERT(Assigned(Parent));
// Don't use recursive calls here, they are not necessary
Widget := Parent;
while not Assigned(Widget.FStyle) do
begin
Widget := Widget.Parent;
ASSERT(Assigned(Widget));
end;
Result := Widget.FStyle;
end;
end;
function TWidget.ProcessEvent(Event: TEventObj): Boolean;
var
Canvas: TFCanvas;
Matrix: TGfxMatrix;
ClientPos: TPoint;
PreparationEvent: TPreparePaintEventObj;
begin
// Handle events which must be processed before the children get them
if Event.InheritsFrom(TResizedEventObj) then
begin
if TResizedEventObj(Event).IsForced then
Include(WidgetState, wsSizeIsForced)
else
Exclude(WidgetState, wsSizeIsForced);
Resized;
Result := DistributeEvent(Event);
end
else if Event.InheritsFrom(TEnabledChangeEventObj) then
Result := EvEnabledChange(TEnabledChangeEventObj(Event))
else if Event.InheritsFrom(TVisibilityChangeEventObj) then
Result := EvVisibilityChange(TVisibilityChangeEventObj(Event)) or DistributeEvent(Event)
else if Event.InheritsFrom(TMouseEnterEventObj) then
Result := EvMouseEnter(TMouseEnterEventObj(Event)) or DistributeEvent(Event)
else if Event.InheritsFrom(TPreparePaintEventObj) then
begin
Canvas := TPreparePaintEventObj(Event).Canvas;
if wsOpaque in WidgetStyle then
begin
Canvas.ExcludeClipRect(BoundsRect);
Result := False;
end
else
begin
Matrix := Canvas.Matrix;
ClientPos := ClientToWidget(Origin);
Canvas.AppendTranslation(ClientPos);
Result := DistributeEvent(Event);
Canvas.Matrix := Matrix;
end;
end
else if Event.InheritsFrom(TPaintEventObj) then
begin
Canvas := TPaintEventObj(Event).Canvas;
Canvas.SaveState;
PreparationEvent := TPreparePaintEventObj.Create(Self, Canvas);
DistributeEvent(PreparationEvent);
PreparationEvent.Release;
Paint(Canvas);
Canvas.RestoreState;
Result := DistributeEvent(Event);
end
else
begin
// First distribute the event to all children, then try to handle them here
Result := DistributeEvent(Event);
if not Result then
begin
if Event.InheritsFrom(TCalcSizesEventObj) then
EvCalcSizes(TCalcSizesEventObj(Event))
{ if Event.InheritsFrom(TUpdateEventObj) then
Result := EvUpdate(TUpdateEventObj(Event))}
else if Event.InheritsFrom(TMousePressedEventObj) then
Result := EvMousePressed(TMousePressedEventObj(Event))
else if Event.InheritsFrom(TMouseReleasedEventObj) then
Result := EvMouseReleased(TMouseReleasedEventObj(Event))
else if Event.InheritsFrom(TMouseLeaveEventObj) then
Result := EvMouseLeave(TMouseLeaveEventObj(Event))
else if Event.InheritsFrom(TMouseLeaveCheckEventObj) then
Result := EvMouseLeaveCheck(TMouseLeaveCheckEventObj(Event));
end;
end;
end;
function TWidget.DistributeEvent(Event: TEventObj): Boolean;
begin
// Do nothing here, as TWidget itself doesn't have children
Result := False;
end;
procedure TWidget.SetParent(AParent: TWidget);
begin
// !!!: reparenting when changing the form is not possible
if AParent <> FParent then
begin
// Remove the widget from the old parent, if it had a parent...
if Assigned(FParent) and FParent.InheritsFrom(TContainerWidget) then
TContainerWidget(FParent).RemoveChild(Self);
FParent := AParent;
// ...and add it to the new parent, if existent.
if Assigned(Parent) and Parent.InheritsFrom(TContainerWidget) then
TContainerWidget(Parent).InsertChild(Self);
end;
end;
function TWidget.GetBoundsRect: TRect;
begin
Result.TopLeft := Origin;
Result.BottomRight := Origin + BoundsSize;
end;
function TWidget.GetLeft: Integer;
begin
Result := Origin.x;
end;
function TWidget.GetTop: Integer;
begin
Result := Origin.y;
end;
function TWidget.GetWidth: Integer;
begin
Result := BoundsSize.cx;
end;
function TWidget.GetHeight: Integer;
begin
Result := BoundsSize.cy;
end;
procedure TWidget.SetCanExpandWidth(allow: Boolean);
begin
if FCanExpandWidth <> allow then
begin
FCanExpandWidth := allow;
Update;
end;
end;
procedure TWidget.SetCanExpandHeight(allow: Boolean);
begin
if FCanExpandHeight <> allow then
begin
FCanExpandHeight := allow;
Update;
end;
end;
procedure TWidget.SetText(const AText: String);
begin
if AText <> Text then
begin
FText := AText;
EvTextChanged;
end;
end;
function TWidget.EvCalcSizes(Event: TCalcSizesEventObj): Boolean;
begin
LAYOUTTRACE('TWidget.EvCalcSizes for %s:%s', [Name, ClassName]);
FMinSize := gfxbase.Size(0, 0);
FMaxSize := gfxbase.Size(InfiniteSize, InfiniteSize);
FDefSize := gfxbase.Size(0, 0);
CalcSizes;
if MinSize.cx = 0 then FMinSize.cx := 1;
if MinSize.cy = 0 then FMinSize.cy := 1;
if DefSize.cx < MinSize.cx then FDefSize.cx := MinSize.cx;
if DefSize.cy < MinSize.cy then FDefSize.cy := MinSize.cy;
if (not FCanExpandWidth) or (MaxSize.cx < DefSize.cx) then
FMaxSize.cx := DefSize.cx;
if (not FCanExpandHeight) or (MaxSize.cy < DefSize.cy) then
FMaxSize.cy := DefSize.cy;
Result := False;
end;
function TWidget.EvEnabledChange(Event: TEnabledChangeEventObj): Boolean;
var
NewState: Boolean;
begin
if Assigned(Parent) then
NewState := Enabled and (wsEnabled in Parent.WidgetState)
else
NewState := Enabled;
if NewState and not (wsEnabled in WidgetState) then
begin
Include(WidgetState, wsEnabled);
Redraw;
Result := DistributeEvent(Event);
end else if (not NewState) and (wsEnabled in WidgetState) then
begin
Exclude(WidgetState, wsEnabled);
if wsHasFocus in WidgetState then
FindForm.FocusedWidget := nil;
Redraw;
Result := DistributeEvent(Event);
end else
Result := False;
end;
function TWidget.EvVisibilityChange(Event: TVisibilityChangeEventObj): Boolean;
begin
if Visible then
begin
if (not Assigned(Parent)) or (wsIsVisible in Parent.WidgetState) then
Include(WidgetState, wsIsVisible);
end else
Exclude(WidgetState, wsIsVisible);
Result := False;
end;
function TWidget.EvMousePressed(Event: TMousePressedEventObj): Boolean;
begin
if (wsClickable in WidgetStyle) and (wsEnabled in WidgetState) and
(Event.Button = mbLeft) then
begin
if wsCaptureMouse in WidgetStyle then
FindForm.MouseCaptureWidget := Self;
Include(WidgetState, wsClicked);
Include(WidgetState, wsHasFocus);
SetFocus;
Redraw;
Result := True;
end
else
Result := False;
end;
function TWidget.EvMouseReleased(Event: TMouseReleasedEventObj): Boolean;
begin
if (wsClickable in WidgetStyle) and (wsEnabled in WidgetState) and
(Event.Button = mbLeft) then
begin
if wsClicked in WidgetState then
begin
Exclude(WidgetState, wsClicked);
with Event do
if (Position.x >= 0) and (Position.y >= 0)
and (Position.x < BoundsSize.cx)
and (Position.y < BoundsSize.cy) then
Click
else
Redraw;
end;
if wsCaptureMouse in WidgetStyle then
FindForm.MouseCaptureWidget := nil;
Result := True;
end else
Result := False;
end;
function TWidget.EvMouseEnter(Event: TMouseEnterEventObj): Boolean;
begin
Include(WidgetState, wsMouseInside);
if Cursor <> crDefault then
Event.NewCursor := Cursor;
if (wsClickable in WidgetStyle) and (wsClicked in WidgetState) and
(wsEnabled in WidgetState) then
Redraw;
Result := False;
// WriteLn('Mouse entered ', Name, ':', ClassName, '. New cursor: ', Ord(Event.NewCursor));
end;
function TWidget.EvMouseLeave(Event: TMouseLeaveEventObj): Boolean;
begin
Exclude(WidgetState, wsMouseInside);
if (wsClickable in WidgetStyle) and (wsClicked in WidgetState) and
(wsEnabled in WidgetState) then
Redraw;
Result := False;
// WriteLn('Mouse left ', Name, ':', ClassName);
end;
function TWidget.EvMouseLeaveCheck(Event: TMouseLeaveCheckEventObj): Boolean;
begin
if ((Event.Position.x < 0) or (Event.Position.y < 0) or
(Event.Position.x >= BoundsSize.cx) or
(Event.Position.y >= BoundsSize.cy)) then
begin
if wsMouseInside in WidgetState then
SendEvent(TMouseLeaveEventObj.Create(Self))
end else if (FindForm.MouseCaptureWidget = Self) and
not (wsMouseInside in WidgetState) then
SendEvent(TMouseEnterEventObj.Create(Self, Event.Shift, Event.Position));
if (wsMouseInside in WidgetState) and (Event.NewCursor = crDefault) and
(Cursor <> crDefault) then
begin
Event.NewCursor := Cursor;
end;
Result := False;
end;
{$ENDIF read_implementation}
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