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richmemo: Win32 special code for WS.PrintTo(). WM_PRINT doesn't work as expected for RICHEDIT

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git-svn-id: https://svn.code.sf.net/p/lazarus-ccr/svn@7381 8e941d3f-bd1b-0410-a28a-d453659cc2b4
This commit is contained in:
skalogryz
2020-04-14 02:38:56 +00:00
parent 00155466f5
commit 6de4d85840
1 changed files with 65 additions and 0 deletions
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65
components/richmemo/win32/win32richmemo.pas
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@ -141,6 +141,8 @@ type
class function GetCanRedo(const AWinControl: TWinControl): Boolean; override;
class procedure ScrollBy(const AWinControl: TWinControl; DeltaX, DeltaY: integer); override;
class procedure PaintTo(const AWinControl: TWinControl; ADC: HDC; X, Y: Integer); override;
end;
{ TWin32Inline }
@ -1547,6 +1549,69 @@ begin
RichEditManager.SetScroll(AWinControl.Handle, pt);
end;
class procedure TWin32WSCustomRichMemo.PaintTo(const AWinControl: TWinControl;
ADC: HDC; X, Y: Integer);
var
fmt : TFormatRange;
cxPhysOffset : Integer;
cyPhysOffset : Integer;
cxPhys : Integer;
cyPhys : Integer;
xx, yy: integer;
r : TRect;
begin
if not AWinControl.HandleAllocated then Exit;
// why would WinAPI make things easier if it can make them harder?!
// WM_PRINT doesn't seem to be fully functinoal for RICHEDIT
// EM_FORMATRANGE needs to be used
TWin32WSWinControl.PaintTo(AWinControl, ADC, X,Y);
fmt.hdc:=ADC;
fmt.hdcTarget:=ADC;
fmt.chrg.cpMin:=CharAtPos(AWinControl,1,1);
fmt.chrg.cpMax:=TCustomRichMemo(AWinControl).GetTextLen;
case GetDeviceCaps(adc, TECHNOLOGY) of
DT_RASDISPLAY, DT_DISPFILE: begin
Windows.GetClientRect(AWinControl.Handle, r);
r:=Bounds(0,0,AWinControl.Width,AWinControl.Height);
//todo: to be properly read from the border settings
InflateRect(r, -4, -4);
fmt.rcPage.left := MulDiv(r.Left, 1440, GetDeviceCaps(adc, LOGPIXELSX));
fmt.rcPage.top := MulDiv(r.Top, 1440, GetDeviceCaps(adc, LOGPIXELSY));
fmt.rcPage.right := MulDiv(r.Right, 1440, GetDeviceCaps(adc, LOGPIXELSX));
fmt.rcPage.bottom := MulDiv(r.Bottom,1440, GetDeviceCaps(adc, LOGPIXELSY));
fmt.rc:=Bounds(
MulDiv(X+2,1440, GetDeviceCaps(adc, LOGPIXELSY)),
MulDiv(Y+2,1440, GetDeviceCaps(adc, LOGPIXELSY)),
fmt.rcPage.Right-fmt.rcPage.Left, fmt.rcPage.Bottom-fmt.rcPage.top);;
end;
DT_RASPRINTER,DT_PLOTTER,DT_METAFILE: begin
cxPhysOffset := GetDeviceCaps(adc, PHYSICALOFFSETX);
cyPhysOffset := GetDeviceCaps(adc, PHYSICALOFFSETY);
cxPhys := GetDeviceCaps(adc, PHYSICALWIDTH);
cyPhys := GetDeviceCaps(adc, PHYSICALHEIGHT);
// Set page rect to physical page size in twips.
fmt.rcPage.top := 0;
fmt.rcPage.left := 0;
fmt.rcPage.right := MulDiv(cxPhys, 1440, GetDeviceCaps(adc, LOGPIXELSX));
fmt.rcPage.bottom := MulDiv(cyPhys, 1440, GetDeviceCaps(adc, LOGPIXELSY));
// Set the rendering rectangle to the pintable area of the page.
fmt.rc.left := cxPhysOffset;
fmt.rc.right := cxPhysOffset + cxPhys;
fmt.rc.top := cyPhysOffset;
fmt.rc.bottom := cyPhysOffset + cyPhys;
end;
end;
SendMessage(AWinControl.Handle, EM_FORMATRANGE, 1, LPARAM(@fmt));
// free mem. See MSDN
SendMessage(AWinControl.Handle, EM_FORMATRANGE, 0, 0);
end;
// The function doesn't use Windows 7 (Vista?) animations. And should.
function ThemedNCPaint(AWindow: Windows.HANDLE; RichMemo: TCustomRichMemo; WParam: WParam; LParam: LParam; var Handled: Boolean): LResult;
begin