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1cd9bfb7a0
DrawText: qt, gtk - add support for DT_EXPANDTABS TCustomLabel: draw with ExpandTabs = true (issue #0011050) git-svn-id: trunk@14702 -
485 lines
14 KiB
PHP
485 lines
14 KiB
PHP
{%MainUnit ../stdctrls.pp}
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{******************************************************************************
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TCustomLabel
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******************************************************************************
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*****************************************************************************
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* *
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* This file is part of the Lazarus Component Library (LCL) *
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* *
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* See the file COPYING.modifiedLGPL, included in this distribution, *
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* for details about the copyright. *
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* *
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* This program is distributed in the hope that it will be useful, *
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* but WITHOUT ANY WARRANTY; without even the implied warranty of *
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. *
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* *
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*****************************************************************************
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TODO:
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- Enable Tabbing/Focusing to focus FocusControl
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- Enable Escaped '&' Shortcut to focus FocusControl
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- Compare/Match AutoSize to Delphi/Kylix's
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- ?? Check For Full Delphi/Kylix Compatibility
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}
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procedure TCustomLabel.CalculatePreferredSize(
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var PreferredWidth, PreferredHeight: integer; WithThemeSpace: Boolean);
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// assumes: (Parent <> nil) and Parent.HandleAllocated
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var
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R : TRect;
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DC : hDC;
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Flags: Cardinal;
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OldFont: HGDIOBJ;
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LabelText: string;
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begin
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if (Parent=nil) or (not Parent.HandleAllocated) then Exit;
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DC := GetDC(Parent.Handle);
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try
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R := Rect(0, 0, Width, Height);
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OldFont := SelectObject(DC, Font.Reference.Handle);
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Flags := DT_CALCRECT or DT_EXPANDTABS;
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if WordWrap then
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inc(Flags, DT_WORDBREAK)
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else
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if not HasMultiLine then
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inc(Flags, DT_SINGLELINE);
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LabelText := GetLabelText;
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DrawText(DC, PChar(LabelText), Length(LabelText), R, Flags);
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SelectObject(DC, OldFont);
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// add one to be able to display disabled label
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PreferredWidth := R.Right - R.Left + 1;
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PreferredHeight := R.Bottom - R.Top + 1;
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finally
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ReleaseDC(Parent.Handle, DC);
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end;
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end;
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procedure TCustomLabel.FontChanged(Sender: TObject);
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begin
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inherited FontChanged(Sender);
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InvalidatePreferredSize;
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if (Parent<>nil) and Parent.AutoSize then
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Parent.AdjustSize;
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AdjustSize;
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end;
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class function TCustomLabel.GetControlClassDefaultSize: TPoint;
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begin
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Result.X := 65;
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Result.Y := 17;
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end;
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function TCustomLabel.HasMultiLine: boolean;
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var
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s: String;
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begin
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s := GetLabelText;
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result := (pos(#10, s) > 0) or (pos(#13, s) > 0);
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end;
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procedure TCustomLabel.DoAutoSize;
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var
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NewWidth, NewHeight: integer;
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CurAnchors: TAnchors;
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begin
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//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)));
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if OptimalFill and (not AutoSize) then
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begin
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AdjustFontForOptimalFill;
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exit;
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end;
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if AutoSizeDelayed then
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exit;
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GetPreferredSize(NewWidth, NewHeight);
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//debugln('TCustomLabel.DoAutoSize ',dbgsName(Self),' Nice ',dbgs(Left),',',dbgs(Top),',w=',dbgs(NewWidth),',h=',dbgs(NewHeight),' Caption="',dbgstr(Caption),'"');
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CurAnchors:=[];
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if Align in [alLeft,alRight,alBottom,alTop,alClient] then
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CurAnchors:=AnchorAlign[Align];
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CurAnchors:=Anchors+CurAnchors;
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if CurAnchors*[akLeft,akRight]=[akLeft,akRight] then
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NewWidth:=Width;
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if CurAnchors*[akTop,akBottom]=[akTop,akBottom] then
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NewHeight:=Height;
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//debugln('TCustomLabel.DoAutoSize ',dbgsName(Self),' Anchored ',dbgs(Left),',',dbgs(Top),',w=',dbgs(NewWidth),',h=',dbgs(NewHeight));
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SetBoundsKeepBase(Left, Top, NewWidth, NewHeight);
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end;
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procedure TCustomLabel.SetAlignment(Value : TAlignment);
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begin
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//debugln('TCustomLabel.SetAlignment Old=',dbgs(ord(Alignment)),' New=',dbgs(ord(Value)),' csLoading=',dbgs(csLoading in ComponentState));
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if FAlignment <> Value then
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begin
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FAlignment := Value;
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Invalidate;
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end;
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end;
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procedure TCustomLabel.Notification(AComponent : TComponent; Operation : TOperation);
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begin
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inherited Notification(AComponent, Operation);
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if (AComponent = FFocusControl) and (Operation = opRemove) then
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FFocusControl:= nil;
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end;
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procedure TCustomLabel.SetFocusControl(Value : TWinControl);
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begin
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if Value <> FFocusControl then
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begin
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FFocusControl:= Value;
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if Value <> nil then
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Value.FreeNotification(Self);
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end;
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end;
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procedure TCustomLabel.WMActivate(var Message: TLMActivate);
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begin
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if (FFocusControl <> nil) and (FFocusControl.CanFocus) then
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FFocusControl.SetFocus;
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end;
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function TCustomLabel.GetAlignment : TAlignment;
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begin
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Result := FAlignment;
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end;
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function TCustomLabel.GetLabelText: string;
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begin
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Result := Caption;
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end;
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procedure TCustomLabel.SetShowAccelChar(Value : Boolean);
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begin
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if FShowAccelChar <> Value then
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begin
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FShowAccelChar := Value;
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Invalidate;
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end;
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end;
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procedure TCustomLabel.TextChanged;
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begin
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Invalidate;
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InvalidatePreferredSize;
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if (Parent<>nil) and Parent.AutoSize then
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Parent.AdjustSize;
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AdjustSize;
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end;
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procedure TCustomLabel.Resize;
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begin
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inherited Resize;
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if OptimalFill and (not AutoSize) then
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AdjustFontForOptimalFill;
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end;
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function TCustomLabel.GetShowAccelChar : Boolean;
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begin
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Result := FShowAccelChar;
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end;
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function TCustomLabel.CanTab: boolean;
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begin
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Result:=false;
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end;
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procedure TCustomLabel.DoMeasureTextPosition(var TextTop: integer;
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var TextLeft: integer);
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var
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lTextHeight: integer;
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lTextWidth: integer;
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begin
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TextLeft := 0;
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if Layout = tlTop then
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begin
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TextTop := 0;
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end else
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begin
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GetPreferredSize(lTextWidth, lTextHeight, True);
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case Layout of
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tlCenter: TextTop := (Height - lTextHeight) div 2;
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tlBottom: TextTop := Height - lTextHeight;
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end;
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end;
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end;
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constructor TCustomLabel.Create(TheOwner: TComponent);
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begin
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inherited Create(TheOwner);
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ControlStyle := [csSetCaption, csClickEvents, csDoubleClicks, csReplicatable];
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SetInitialBounds(0, 0, GetControlClassDefaultSize.X, GetControlClassDefaultSize.Y);
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FShowAccelChar := True;
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Color := clNone;
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AutoSize := True;
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end;
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function TCustomLabel.GetTransparent: boolean;
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begin
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Result := Color = clNone;
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end;
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procedure TCustomLabel.SetColor(NewColor: TColor);
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begin
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inherited;
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// if color = clnone then transparent, so not opaque
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if NewColor = clNone then
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ControlStyle := ControlStyle - [csOpaque]
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else
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ControlStyle := ControlStyle + [csOpaque];
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end;
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{------------------------------------------------------------------------------
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Method: TCustomLabel.SetLayout
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Params: None
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Returns: Nothing
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------------------------------------------------------------------------------}
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procedure TCustomLabel.SetLayout(Value: TTextLayout);
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begin
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if FLayout <> Value then
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begin
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FLayout:= Value;
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Invalidate;
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end;
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end;
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procedure TCustomLabel.SetTransparent(NewTransparent: boolean);
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begin
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if Transparent = NewTransparent then
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exit;
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if NewTransparent then
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Color := clNone
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else
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if Color = clNone then
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Color := clBackground;
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end;
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{------------------------------------------------------------------------------
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Method: TCustomLabel.SetWordWrap
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Params: None
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Returns: Nothing
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------------------------------------------------------------------------------}
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procedure TCustomLabel.SetWordWrap(Value: Boolean);
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begin
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if fWordWrap <> value then begin
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fWordWrap:= value;
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Invalidate;
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end;
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end;
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function TCustomLabel.DialogChar(var Message: TLMKey): boolean;
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begin
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Result := false;
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if not FShowAccelChar then exit;
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if FFocusControl = nil then exit;
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if IsAccel(Message.CharCode, GetLabelText) and FFocusControl.CanFocus then
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begin
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Result := true;
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FFocusControl.SetFocus;
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end else
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Result:=inherited DialogChar(Message);
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end;
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procedure TCustomLabel.Loaded;
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begin
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inherited Loaded;
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AdjustSize;
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end;
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{-------------------------------------------------------------------------------
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function TCustomLabel.CalcFittingFontHeight(const TheText: string;
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MaxWidth, MaxHeight: Integer;
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var FontSize, NeededWidth, NeededHeight: integer): Boolean;
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Calculates the maximum font size for TheText to fit into MaxWidth and
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MaxHeight.
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-------------------------------------------------------------------------------}
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function TCustomLabel.CalcFittingFontHeight(const TheText: string;
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MaxWidth, MaxHeight: Integer;
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var FontHeight, NeededWidth, NeededHeight: integer): Boolean;
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var
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R : TRect;
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DC : hDC;
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Flags: Cardinal;
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OldFont: HGDIOBJ;
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MinFontHeight: Integer;
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MaxFontHeight: Integer;
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AFont: TFont;
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CurFontHeight: LongInt;
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begin
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Result:=false;
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if AutoSizeDelayed or (TheText='') or (MaxWidth<1) or (MaxHeight<1) then exit;
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AFont:=TFont.Create;
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AFont.Assign(Font);
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CurFontHeight:=AFont.Height;
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MinFontHeight:=5;
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MaxFontHeight:=MaxHeight*2;
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if (CurFontHeight<MinFontHeight) or (CurFontHeight>MaxFontHeight) then
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CurFontHeight:=(MinFontHeight+MaxFontHeight) div 2;
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Flags := DT_CALCRECT or DT_NOPREFIX or DT_EXPANDTABS;
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if WordWrap then inc(Flags, DT_WORDBREAK);
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// give a clipping rectangle with space, so that the bounds returned by
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// DrawText can be bigger and we know, the tried font is too big.
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R := Rect(0,0, MaxWidth, MaxHeight*2);
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DC := GetDC(Parent.Handle);
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try
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while (MinFontHeight<=MaxFontHeight) and (CurFontHeight>=MinFontHeight)
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and (CurFontHeight<=MaxFontHeight) do begin
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AFont.Height:=CurFontHeight; // NOTE: some TFont do not allow any integer
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//debugln('TCustomLabel.CalcFittingFontHeight A ',dbgs(MinFontHeight),'<=',dbgs(AFont.Height),'<=',dbgs(MaxFontHeight));
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OldFont := SelectObject(DC, AFont.Reference.Handle);
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DrawText(DC, PChar(TheText), Length(TheText), R, Flags);
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SelectObject(DC, OldFont);
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NeededWidth := R.Right - R.Left;
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NeededHeight := R.Bottom - R.Top;
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//debugln('TCustomLabel.CalcFittingFontHeight B NeededWidth=',dbgs(NeededWidth),' NeededHeight=',dbgs(NeededHeight),' MaxWidth=',dbgs(MaxWidth),' MaxHeight=',dbgs(MaxHeight));
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if (NeededWidth>0) and (NeededHeight>0)
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and (NeededWidth<=MaxWidth) and (NeededHeight<=MaxHeight) then begin
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// TheText fits into the bounds
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if (not Result) or (FontHeight<AFont.Height) then
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FontHeight:=AFont.Height;
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Result:=true;
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MinFontHeight:=CurFontHeight;
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// -> try bigger (binary search)
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CurFontHeight:=(MaxFontHeight+CurFontHeight+1) div 2; // +1 to round up
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if CurFontHeight=MinFontHeight then break;
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end else begin
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// TheText does not fit into the bounds
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MaxFontHeight:=CurFontHeight-1;
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// -> try smaller (binary search)
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CurFontHeight:=(MinFontHeight+CurFontHeight) div 2;
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end;
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end
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finally
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ReleaseDC(Parent.Handle, DC);
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AFont.Free;
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end;
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end;
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function TCustomLabel.ColorIsStored: boolean;
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begin
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Result:=(Color<>clNone);
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if Result and ParentColor and (Parent<>nil) then
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Result:=false;
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end;
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{-------------------------------------------------------------------------------
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function TCustomLabel.AdjustFontForOptimalFill: Boolean;
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Maximizes Font.Height
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Return true if Font.Height changed.
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-------------------------------------------------------------------------------}
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function TCustomLabel.AdjustFontForOptimalFill: Boolean;
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var
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NeededWidth: Integer;
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NeededHeight: Integer;
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NewFontHeight: Integer;
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OldFontHeight: LongInt;
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begin
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Result:=false;
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if not CalcFittingFontHeight(GetLabelText,Width,Height,NeededWidth,NeededHeight,
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NewFontHeight) then exit;
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if Font.Height=NewFontHeight then exit;
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//debugln('TCustomLabel.AdjustFontForOptimalFill OldFontHeight=',dbgs(Font.Height),' NewFontHeight=',dbgs(NewFontHeight));
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OldFontHeight:=Font.Height;
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Font.Height:=NewFontHeight;
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Result:=OldFontHeight<>Font.Height;
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end;
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procedure TCustomLabel.Paint;
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var
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TR : TTextStyle;
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R : TRect;
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TextLeft, TextTop: integer;
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LabelText: string;
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OldFontColor: TColor;
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begin
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R := Rect(0,0,Width,Height);
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with Canvas do
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begin
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if Enabled then
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Brush.Color := Self.Color
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else
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Brush.Color := clNone;
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Font := Self.Font;
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if (Color<>clNone) and not Transparent then
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begin
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Brush.Style:=bsSolid;
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FillRect(R);
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end else
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Brush.Style:=bsClear;
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{
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If BorderStyle <> sbsNone then begin
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InflateRect(R,-2,-2);
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Pen.Style := psSolid;
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If BorderStyle = sbsSunken then
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Pen.Color := clBtnShadow
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else
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Pen.Color := clBtnHighlight;
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MoveTo(0, 0);
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LineTo(Width - 1,0);
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MoveTo(0, 0);
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LineTo(0,Height - 1);
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If BorderStyle = sbsSunken then
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Pen.Color := clBtnHighlight
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else
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Pen.Color := clBtnShadow;
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MoveTo(0,Height - 1);
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LineTo(Width - 1,Height - 1);
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MoveTo(Width - 1, 0);
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LineTo(Width - 1,Height);
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end;
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}
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//Brush.Color:=clRed;
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//FillRect(R);
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FillChar(TR,SizeOf(TR),0);
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with TR do
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begin
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Alignment := Self.Alignment;
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WordBreak := wordWrap;
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SingleLine:= not WordWrap and not HasMultiLine;
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Clipping := True;
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ShowPrefix := ShowAccelChar;
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SystemFont := False;
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RightToLeft := UseRightToLeftReading;
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ExpandTabs := True;
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end;
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DoMeasureTextPosition(TextTop, TextLeft);
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//debugln('TCustomLabel.Paint ',dbgs(Alignment=tacenter),' ',dbgs(Layout=tlCenter),' ',dbgs(TextLeft),' TextTop=',dbgs(TextTop),' ',dbgs(R));
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LabelText := GetLabelText;
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OldFontColor := Font.Color;
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if not Enabled then
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begin
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Font.Color := clBtnHighlight;
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TextRect(R, TextLeft + 1, TextTop + 1, LabelText, TR);
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Font.Color := clBtnShadow;
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end;
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TextRect(R, TextLeft, TextTop, LabelText, TR);
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Font.Color := OldFontColor;
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end;
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end;
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procedure TCustomLabel.SetOptimalFill(const AValue: Boolean);
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begin
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if FOptimalFill=AValue then exit;
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FOptimalFill:=AValue;
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if OptimalFill and AutoSize then
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AutoSize:=false;
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Invalidate;
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end;
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// included by stdctrls.pp
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