mirror of
https://gitlab.com/freepascal.org/lazarus/lazarus.git
synced 2025-05-25 12:42:53 +02:00
498 lines
14 KiB
PHP
498 lines
14 KiB
PHP
{%MainUnit ../stdctrls.pp}
|
|
|
|
{******************************************************************************
|
|
TCustomLabel
|
|
******************************************************************************
|
|
|
|
*****************************************************************************
|
|
This file is part of the Lazarus Component Library (LCL)
|
|
|
|
See the file COPYING.modifiedLGPL.txt, included in this distribution,
|
|
for details about the license.
|
|
*****************************************************************************
|
|
|
|
TODO:
|
|
|
|
- Enable Tabbing/Focusing to focus FocusControl
|
|
- Enable Escaped '&' Shortcut to focus FocusControl
|
|
- Compare/Match AutoSize to Delphi/Kylix's
|
|
- ?? Check For Full Delphi/Kylix Compatibility
|
|
|
|
}
|
|
|
|
procedure TCustomLabel.CalculatePreferredSize(
|
|
var PreferredWidth, PreferredHeight: integer; WithThemeSpace: Boolean);
|
|
// assumes: (Parent <> nil) and Parent.HandleAllocated
|
|
var
|
|
AWidth: Integer;
|
|
begin
|
|
if (Parent = nil) or (not Parent.HandleAllocated) then Exit;
|
|
if WidthIsAnchored and WordWrap then
|
|
AWidth:=Width
|
|
else
|
|
AWidth:=10000;
|
|
AWidth:=Constraints.MinMaxWidth(AWidth);
|
|
CalculateSize(AWidth,PreferredWidth,PreferredHeight);
|
|
end;
|
|
|
|
procedure TCustomLabel.CalculateSize(MaxWidth: integer; var NeededWidth,
|
|
NeededHeight: integer);
|
|
var
|
|
DC: HDC;
|
|
R: TRect;
|
|
OldFont: HGDIOBJ;
|
|
Flags: cardinal;
|
|
LabelText: String;
|
|
begin
|
|
LabelText := GetLabelText;
|
|
if LabelText='' then begin
|
|
NeededWidth:=1;
|
|
NeededHeight:=1;
|
|
exit;
|
|
end;
|
|
|
|
DC := GetDC(Parent.Handle);
|
|
try
|
|
R := Rect(0, 0, MaxWidth, 10000);
|
|
OldFont := SelectObject(DC, HGDIOBJ(Font.Reference.Handle));
|
|
Flags := DT_CALCRECT or DT_EXPANDTABS;
|
|
if WordWrap then
|
|
Flags := Flags or DT_WORDBREAK
|
|
else
|
|
if not HasMultiLine then
|
|
Flags := Flags or DT_SINGLELINE;
|
|
|
|
if not ShowAccelChar then
|
|
Flags := Flags or DT_NOPREFIX;
|
|
|
|
DrawText(DC, PChar(LabelText), Length(LabelText), R, Flags);
|
|
SelectObject(DC, OldFont);
|
|
NeededWidth := R.Right - R.Left;
|
|
NeededHeight := R.Bottom - R.Top;
|
|
//DebugLn(['TCustomLabel.CalculatePreferredSize ',DbgSName(Self),' R=',dbgs(R),' MaxWidth=',MaxWidth,' DT_WORDBREAK=',(DT_WORDBREAK and Flags)>0,' LabelText="',LabelText,'"']);
|
|
finally
|
|
ReleaseDC(Parent.Handle, DC);
|
|
end;
|
|
end;
|
|
|
|
procedure TCustomLabel.FontChanged(Sender: TObject);
|
|
begin
|
|
inherited FontChanged(Sender);
|
|
UpdateSize;
|
|
end;
|
|
|
|
class function TCustomLabel.GetControlClassDefaultSize: TSize;
|
|
begin
|
|
Result.CX := 65;
|
|
Result.CY := 17;
|
|
end;
|
|
|
|
function TCustomLabel.HasMultiLine: boolean;
|
|
var
|
|
s: String;
|
|
begin
|
|
s := GetLabelText;
|
|
Result := (pos(#10, s) > 0) or (pos(#13, s) > 0);
|
|
end;
|
|
|
|
procedure TCustomLabel.DoAutoSize;
|
|
begin
|
|
inherited DoAutoSize;
|
|
//debugln('TCustomLabel.DoAutoSize ',DbgSName(Self),' AutoSizing=',dbgs(AutoSizing),' AutoSize=',dbgs(AutoSize),' Parent=',DbgSName(Parent),' csLoading=',dbgs(csLoading in ComponentState),' Parnet.HandleAllocated=',dbgs((Parent<>nil) and (Parent.HandleAllocated)));
|
|
end;
|
|
|
|
procedure TCustomLabel.SetAlignment(Value : TAlignment);
|
|
begin
|
|
//debugln('TCustomLabel.SetAlignment Old=',dbgs(ord(Alignment)),' New=',dbgs(ord(Value)),' csLoading=',dbgs(csLoading in ComponentState));
|
|
if FAlignment <> Value then
|
|
begin
|
|
FAlignment := Value;
|
|
Invalidate;
|
|
end;
|
|
end;
|
|
|
|
procedure TCustomLabel.Notification(AComponent : TComponent; Operation : TOperation);
|
|
begin
|
|
inherited Notification(AComponent, Operation);
|
|
if (AComponent = FFocusControl) and (Operation = opRemove) then
|
|
FFocusControl := nil;
|
|
end;
|
|
|
|
procedure TCustomLabel.SetFocusControl(Value : TWinControl);
|
|
begin
|
|
if Value <> FFocusControl then
|
|
begin
|
|
if FFocusControl <> nil then
|
|
FFocusControl.RemoveFreeNotification(Self);
|
|
FFocusControl:= Value;
|
|
if Value <> nil then
|
|
Value.FreeNotification(Self);
|
|
end;
|
|
end;
|
|
|
|
procedure TCustomLabel.WMActivate(var Message: TLMActivate);
|
|
begin
|
|
if (FFocusControl <> nil) and (FFocusControl.CanFocus) then
|
|
FFocusControl.SetFocus;
|
|
end;
|
|
|
|
function TCustomLabel.GetLabelText: string;
|
|
begin
|
|
Result := Caption;
|
|
end;
|
|
|
|
procedure TCustomLabel.SetShowAccelChar(Value : Boolean);
|
|
begin
|
|
if FShowAccelChar <> Value then
|
|
begin
|
|
FShowAccelChar := Value;
|
|
Invalidate;
|
|
UpdateSize;
|
|
end;
|
|
end;
|
|
|
|
procedure TCustomLabel.TextChanged;
|
|
begin
|
|
Invalidate;
|
|
UpdateSize;
|
|
end;
|
|
|
|
procedure TCustomLabel.DoSetBounds(ALeft, ATop, AWidth, AHeight: integer);
|
|
var
|
|
WidthChanged: Boolean;
|
|
begin
|
|
WidthChanged:=AWidth<>Width;
|
|
inherited DoSetBounds(ALeft, ATop, AWidth, AHeight);
|
|
if OptimalFill and (not AutoSize) then
|
|
AdjustFontForOptimalFill;
|
|
if WidthChanged and WordWrap then begin
|
|
InvalidatePreferredSize;
|
|
AdjustSize;
|
|
end;
|
|
end;
|
|
|
|
function TCustomLabel.CanTab: boolean;
|
|
begin
|
|
Result := False;
|
|
end;
|
|
|
|
procedure TCustomLabel.DoMeasureTextPosition(var TextTop: integer;
|
|
var TextLeft: integer);
|
|
var
|
|
lTextHeight: integer;
|
|
lTextWidth: integer;
|
|
begin
|
|
TextLeft := 0;
|
|
if Layout = tlTop then
|
|
begin
|
|
TextTop := 0;
|
|
end else
|
|
begin
|
|
CalculateSize(Width, lTextWidth, lTextHeight);
|
|
case Layout of
|
|
tlCenter: TextTop := (Height - lTextHeight) div 2;
|
|
tlBottom: TextTop := Height - lTextHeight;
|
|
end;
|
|
end;
|
|
end;
|
|
|
|
constructor TCustomLabel.Create(TheOwner: TComponent);
|
|
begin
|
|
inherited Create(TheOwner);
|
|
ControlStyle := [csCaptureMouse, csSetCaption, csClickEvents, csDoubleClicks, csReplicatable];
|
|
with GetControlClassDefaultSize do
|
|
SetInitialBounds(0, 0, CX, CY);
|
|
FShowAccelChar := True;
|
|
FInternalSetBounds := False;
|
|
Color := clNone;
|
|
AutoSize := True;
|
|
// Accessibility
|
|
AccessibleRole := larLabel;
|
|
end;
|
|
|
|
function TCustomLabel.GetTransparent: boolean;
|
|
begin
|
|
Result := Color = clNone;
|
|
end;
|
|
|
|
procedure TCustomLabel.SetColor(NewColor: TColor);
|
|
begin
|
|
inherited;
|
|
|
|
// if color = clnone then transparent, so not opaque
|
|
if NewColor = clNone then
|
|
ControlStyle := ControlStyle - [csOpaque]
|
|
else
|
|
ControlStyle := ControlStyle + [csOpaque];
|
|
end;
|
|
|
|
{------------------------------------------------------------------------------
|
|
Method: TCustomLabel.SetLayout
|
|
Params: None
|
|
Returns: Nothing
|
|
|
|
------------------------------------------------------------------------------}
|
|
procedure TCustomLabel.SetLayout(Value: TTextLayout);
|
|
begin
|
|
if FLayout <> Value then
|
|
begin
|
|
FLayout:= Value;
|
|
Invalidate;
|
|
end;
|
|
end;
|
|
|
|
procedure TCustomLabel.SetTransparent(NewTransparent: boolean);
|
|
begin
|
|
if Transparent = NewTransparent then
|
|
exit;
|
|
if NewTransparent then
|
|
Color := clNone
|
|
else
|
|
if Color = clNone then
|
|
Color := clBackground;
|
|
end;
|
|
|
|
{------------------------------------------------------------------------------
|
|
Method: TCustomLabel.SetWordWrap
|
|
Params: None
|
|
Returns: Nothing
|
|
|
|
------------------------------------------------------------------------------}
|
|
procedure TCustomLabel.SetWordWrap(Value: Boolean);
|
|
begin
|
|
if FWordWrap <> Value then
|
|
begin
|
|
FWordWrap := Value;
|
|
Invalidate;
|
|
UpdateSize;
|
|
end;
|
|
end;
|
|
|
|
function TCustomLabel.DialogChar(var Message: TLMKey): boolean;
|
|
begin
|
|
Result := False;
|
|
if not FShowAccelChar then exit;
|
|
if FFocusControl = nil then exit;
|
|
|
|
if IsAccel(Message.CharCode, GetLabelText) and FFocusControl.CanFocus then
|
|
begin
|
|
Result := True;
|
|
FFocusControl.SetFocus;
|
|
end else
|
|
Result := inherited DialogChar(Message);
|
|
end;
|
|
|
|
procedure TCustomLabel.Loaded;
|
|
begin
|
|
inherited Loaded;
|
|
AdjustSize;
|
|
end;
|
|
|
|
procedure TCustomLabel.UpdateSize;
|
|
begin
|
|
InvalidatePreferredSize;
|
|
if OptimalFill and (not AutoSize) then
|
|
AdjustFontForOptimalFill;
|
|
AdjustSize;
|
|
end;
|
|
|
|
{-------------------------------------------------------------------------------
|
|
function TCustomLabel.CalcFittingFontHeight(const TheText: string;
|
|
MaxWidth, MaxHeight: Integer;
|
|
var FontSize, NeededWidth, NeededHeight: integer): Boolean;
|
|
|
|
Calculates the maximum font size for TheText to fit into MaxWidth and
|
|
MaxHeight.
|
|
-------------------------------------------------------------------------------}
|
|
function TCustomLabel.CalcFittingFontHeight(const TheText: string;
|
|
MaxWidth, MaxHeight: Integer;
|
|
var FontHeight, NeededWidth, NeededHeight: integer): Boolean;
|
|
var
|
|
R : TRect;
|
|
DC : hDC;
|
|
Flags: Cardinal;
|
|
OldFont: HGDIOBJ;
|
|
MinFontHeight: Integer;
|
|
MaxFontHeight: Integer;
|
|
AFont: TFont;
|
|
CurFontHeight: LongInt;
|
|
begin
|
|
Result:=false;
|
|
if AutoSizeDelayed or (TheText='') or (MaxWidth<1) or (MaxHeight<1) then exit;
|
|
AFont:=TFont.Create;
|
|
AFont.Assign(Font);
|
|
CurFontHeight:=AFont.Height;
|
|
MinFontHeight:=5;
|
|
MaxFontHeight:=MaxHeight*2;
|
|
if (CurFontHeight<MinFontHeight) or (CurFontHeight>MaxFontHeight) then
|
|
CurFontHeight:=(MinFontHeight+MaxFontHeight) div 2;
|
|
Flags := DT_CALCRECT or DT_NOPREFIX or DT_EXPANDTABS;
|
|
if WordWrap then inc(Flags, DT_WORDBREAK);
|
|
|
|
// give a clipping rectangle with space, so that the bounds returned by
|
|
// DrawText can be bigger and we know, the tried font is too big.
|
|
R := Rect(0,0, MaxWidth, MaxHeight*2);
|
|
|
|
DC := GetDC(Parent.Handle);
|
|
try
|
|
while (MinFontHeight<=MaxFontHeight) and (CurFontHeight>=MinFontHeight)
|
|
and (CurFontHeight<=MaxFontHeight) do begin
|
|
AFont.Height:=CurFontHeight; // NOTE: some TFont do not allow any integer
|
|
//debugln('TCustomLabel.CalcFittingFontHeight A ',dbgs(MinFontHeight),'<=',dbgs(AFont.Height),'<=',dbgs(MaxFontHeight));
|
|
OldFont := SelectObject(DC, HGDIOBJ(AFont.Reference.Handle));
|
|
DrawText(DC, PChar(TheText), Length(TheText), R, Flags);
|
|
SelectObject(DC, OldFont);
|
|
NeededWidth := R.Right - R.Left;
|
|
NeededHeight := R.Bottom - R.Top;
|
|
//debugln('TCustomLabel.CalcFittingFontHeight B NeededWidth=',dbgs(NeededWidth),' NeededHeight=',dbgs(NeededHeight),' MaxWidth=',dbgs(MaxWidth),' MaxHeight=',dbgs(MaxHeight));
|
|
if (NeededWidth>0) and (NeededHeight>0)
|
|
and (NeededWidth<=MaxWidth) and (NeededHeight<=MaxHeight) then begin
|
|
// TheText fits into the bounds
|
|
if (not Result) or (FontHeight<AFont.Height) then
|
|
FontHeight:=AFont.Height;
|
|
Result:=true;
|
|
MinFontHeight:=CurFontHeight;
|
|
// -> try bigger (binary search)
|
|
CurFontHeight:=(MaxFontHeight+CurFontHeight+1) div 2; // +1 to round up
|
|
if CurFontHeight=MinFontHeight then break;
|
|
end else begin
|
|
// TheText does not fit into the bounds
|
|
MaxFontHeight:=CurFontHeight-1;
|
|
// -> try smaller (binary search)
|
|
CurFontHeight:=(MinFontHeight+CurFontHeight) div 2;
|
|
end;
|
|
end
|
|
finally
|
|
ReleaseDC(Parent.Handle, DC);
|
|
AFont.Free;
|
|
end;
|
|
end;
|
|
|
|
function TCustomLabel.ColorIsStored: boolean;
|
|
begin
|
|
Result := (Color <> clNone);
|
|
end;
|
|
|
|
{-------------------------------------------------------------------------------
|
|
function TCustomLabel.AdjustFontForOptimalFill: Boolean;
|
|
|
|
Maximizes Font.Height
|
|
Return true if Font.Height changed.
|
|
-------------------------------------------------------------------------------}
|
|
function TCustomLabel.AdjustFontForOptimalFill: Boolean;
|
|
var
|
|
NeededWidth: Integer;
|
|
NeededHeight: Integer;
|
|
NewFontHeight: Integer;
|
|
OldFontHeight: LongInt;
|
|
begin
|
|
Result := False;
|
|
if not CalcFittingFontHeight(GetLabelText, Width, Height, NewFontHeight,
|
|
NeededWidth, NeededHeight) then Exit;
|
|
if Font.Height = NewFontHeight then Exit;
|
|
//debugln('TCustomLabel.AdjustFontForOptimalFill OldFontHeight=',dbgs(Font.Height),' NewFontHeight=',dbgs(NewFontHeight));
|
|
OldFontHeight := Font.Height;
|
|
Font.Height := NewFontHeight;
|
|
Result := OldFontHeight <> Font.Height;
|
|
end;
|
|
|
|
procedure TCustomLabel.Paint;
|
|
var
|
|
TR : TTextStyle;
|
|
R : TRect;
|
|
TextLeft, TextTop: integer;
|
|
LabelText: string;
|
|
OldFontColor: TColor;
|
|
begin
|
|
R := Rect(0,0,Width,Height);
|
|
with Canvas do
|
|
begin
|
|
Brush.Color := Self.Color;
|
|
if (Color<>clNone) and not Transparent then
|
|
begin
|
|
Brush.Style:=bsSolid;
|
|
FillRect(R);
|
|
end;
|
|
Brush.Style:=bsClear;
|
|
Font := Self.Font;
|
|
{
|
|
If BorderStyle <> sbsNone then begin
|
|
InflateRect(R,-2,-2);
|
|
Pen.Style := psSolid;
|
|
If BorderStyle = sbsSunken then
|
|
Pen.Color := clBtnShadow
|
|
else
|
|
Pen.Color := clBtnHighlight;
|
|
MoveTo(0, 0);
|
|
LineTo(Width - 1,0);
|
|
MoveTo(0, 0);
|
|
LineTo(0,Height - 1);
|
|
If BorderStyle = sbsSunken then
|
|
Pen.Color := clBtnHighlight
|
|
else
|
|
Pen.Color := clBtnShadow;
|
|
MoveTo(0,Height - 1);
|
|
LineTo(Width - 1,Height - 1);
|
|
MoveTo(Width - 1, 0);
|
|
LineTo(Width - 1,Height);
|
|
end;
|
|
}
|
|
//Brush.Color:=clRed;
|
|
//FillRect(R);
|
|
FillChar(TR,SizeOf(TR),0);
|
|
with TR do
|
|
begin
|
|
Alignment := BidiFlipAlignment(Self.Alignment, UseRightToLeftAlignment);
|
|
Layout := Self.Layout;
|
|
Opaque := (Color<>clNone) and not Transparent;
|
|
WordBreak := wordWrap;
|
|
SingleLine:= not WordWrap and not HasMultiLine;
|
|
Clipping := True;
|
|
ShowPrefix := ShowAccelChar;
|
|
SystemFont := False;
|
|
RightToLeft := UseRightToLeftReading;
|
|
ExpandTabs := True;
|
|
end;
|
|
DoMeasureTextPosition(TextTop, TextLeft);
|
|
//debugln('TCustomLabel.Paint ',dbgs(Alignment=tacenter),' ',dbgs(Layout=tlCenter),' ',dbgs(TextLeft),' TextTop=',dbgs(TextTop),' ',dbgs(R));
|
|
LabelText := GetLabelText;
|
|
OldFontColor := Font.Color;
|
|
if not IsEnabled then
|
|
begin
|
|
Font.Color := clBtnHighlight;
|
|
TextRect(R, TextLeft + 1, TextTop + 1, LabelText, TR);
|
|
Font.Color := clBtnShadow;
|
|
end;
|
|
TextRect(R, TextLeft, TextTop, LabelText, TR);
|
|
Font.Color := OldFontColor;
|
|
end;
|
|
end;
|
|
|
|
procedure TCustomLabel.SetBounds(aLeft, aTop, aWidth, aHeight: integer);
|
|
begin
|
|
if (Left=aLeft) and (Top=aTop) and (Width=aWidth) and (Height=aHeight) then exit;
|
|
if not FInternalSetBounds and AutoSize and WordWrap then
|
|
InvalidatePreferredSize;
|
|
inherited SetBounds(aLeft, aTop, aWidth, aHeight);
|
|
end;
|
|
|
|
procedure TCustomLabel.SetOptimalFill(const AValue: Boolean);
|
|
begin
|
|
if FOptimalFill = AValue then Exit;
|
|
FOptimalFill := AValue;
|
|
if OptimalFill and AutoSize then
|
|
AutoSize := False;
|
|
Invalidate;
|
|
end;
|
|
|
|
class procedure TCustomLabel.WSRegisterClass;
|
|
begin
|
|
inherited WSRegisterClass;
|
|
RegisterCustomLabel;
|
|
RegisterPropertyToSkip(TCustomLabel, 'EllipsisPosition', 'VCL compatibility property', '');
|
|
end;
|
|
|
|
// included by stdctrls.pp
|
|
|
|
|