How can I get the screen resolution in Firemonkey 2 (Delphi XE3)?
It's all changed in XE3. The platform support has been completely overhauled. See Pawel Glowacki's article for more.
var
ScreenSvc: IFMXScreenService;
Size: TPointF;
begin
if TPlatformServices.Current.SupportsPlatformService(IFMXScreenService, IInterface(ScreenSvc)) then
begin
Size := ScreenSvc.GetScreenSize;
....
end;
end;
In spite of the overhaul, this is still not much use if you have multiple monitors. Perhaps there is some multimon support in FMX2, but it's clearly not available in IFMXScreenService.
Related
I have projects developed in Delphi 10 on a laptop with a screen resolution of 96. I am now using Delphi 10.4 Community Edition on a Microsoft Surface with a screen resolution of 201. Is there a function or a settings that automatically converts numerically defined coordinates when scaling an application? To show what I mean I add this code snippet.
procedure TForm1.Button1Click(Sender: TObject);
begin
with Canvas do
begin
MoveTo(0,0);
LineTo(400,250);
MoveTo(0,0);
LineTo(ClientWidth,ClientHeight);
end;
end;
The first line drawn does not scale, the second one obviously does.
May I add:
If I compile the same code on my old laptop with a screen resolution of 96 and then run the exe file on my Surface Laptop with a screen resolution of 201 it scales ok, I was hoping there was a facility somewhere to compile my old programmes on my new computer without having to manually change all the code referring to coordinates x and y.
There's no built-in scaling of coordinates in a TCanvas. You can use this CLASS HELPER:
TYPE
TFormHelper = CLASS HELPER FOR TForm
FUNCTION Scale(Value : INTEGER) : INTEGER;
END;
FUNCTION TFormHelper.Scale(Value : INTEGER) : INTEGER;
BEGIN
Result:=MulDiv(Value,CurrentPPI,Screen.DefaultPixelsPerInch)
END;
Use it as in:
procedure TForm1.Button1Click(Sender: TObject);
begin
with Canvas do
begin
MoveTo(Scale(0),Scale(0)); // Not needed, as 0 scaled is always 0, but... //
LineTo(Scale(400),Scale(250));
MoveTo(0,0);
LineTo(ClientWidth,ClientHeight);
end;
end;
To run my projects developed with Delphi 10 on my new computer with a higher screen resolution, using Delphi 10.4 Community Edition I change the setting
Project Options -> Application -> Manifest -> DPI Awareness to GDI Scaling and it all works like a charm.
I have been asked to correct an issue (not related to this question) in a legacy Delphi program. After fixing some issues with missing components, I am now stuck with some GDI Plus functionality, which stops me from compiling the program. One of the functions where this is used is:
function TDownLoadItem.LoadRawBitmapFromStream(var bm: TBitmap): Boolean;
var
image: TGPBitmap;
begin
Result := False;
if Content.Size = 0 then
exit;
// NOTE: Content is a TMemoryStream, declared globally.
image := GDIPlusHelper.LoadBitmapFromStream(Content); // <== This is where the problem is....
try
bm.Width := image.GetWidth;
bm.Height := image.GetHeight;
with TGPGraphics.Create(bm.Canvas.Handle) do
try
DrawImage(image, 0, 0, image.GetWidth, image.GetHeight);
Result := True;
finally
Free;
end;
finally
image.Free;
end;
end;
I think (not sure) the last Delphi version used was 2006, I am on Delphi Rio 10.3.
Online I have managed to find GDI+ 1.2, but this does not solve the problem. The procedure LoadBitmapFromStream does not exit in these libraries. GDIPlusHelper was apparently renamed to GDIPlusHelpers and most code has changed from classes to interfaces. I suspect an older edition of the GDI Plus libraries were used, but I cannot find these.
Reworking the code would be too complex as it would require Content to be an IStream instead of a TMemoryStream. Also, simply using a TBitmap is not feasible either as other code (not shown) uses functionality specific to TGPBitmap (e.g. RotateFlip).
Any suggestions on how to fix/work around this? Thanks in advance!
In many confirmation dialogs it is usefull to have such option (quick wayt to disable confirmation).
But i can't find how to do that. I don't want to design it myself because i need this dialog to be standard-like and don't wont to redesign with every update of Delphi. Is there simple way to use Delphi standard confirmation dialog with such checkbox ?
UPDATE2. Suggested SynTaskDialog library from Synopse project does great job (all i need and even more), i will use it in my projects. Thanks!
UPDATE. So, thank you guys for ideas. System function MessageBoxCheck is nice solution but seem to be not so stable as it should be. In general i agree that it is good idea to use latest API functions to provide users with best UI experience of modern os and use old-fashioned design for older systems. At moment i stay on simple solution (code is following), but if someone share the code with support of UI for modern OS, it will be nice.
function MsgDlgWithCB(const Msg,Title,CBMsg: string; DlgType: TMsgDlgType;
Buttons: TMsgDlgButtons; DefaultButton: TMsgDlgBtn;
var cbDontAskAnymore: TCheckBox): TForm;
var
i: integer;
b: TButton;
y: integer;
begin
Result := CreateMessageDialog(Msg, DlgType, Buttons, DefaultButton) ;
Result.Position := poScreenCenter;
cbDontAskAnymore := TCheckBox.Create(Result);
cbDontAskAnymore.Caption := CBMsg;
cbDontAskAnymore.Width := 130;
y := -1;
for i := 0 to result.ComponentCount-1 do
if result.Components[i] is TButton then
begin
b := TButton(result.Components[i]);
b.Left := b.Left + cbDontAskAnymore.Width + 16;
Result.ClientWidth := Max(Result.ClientWidth, b.Left+b.Width+16);
y := b.Top+b.Height-cbDontAskAnymore.Height;
end;
if y<0 then
y := Result.ClientHeight - cbDontAskAnymore.height - 16;
Result.Caption := Title;
cbDontAskAnymore.Parent := Result;
cbDontAskAnymore.Top := y;
cbDontAskAnymore.Left := 8;
end;
function MessageDlgCheckbox(const Msg: string; DlgType: TMsgDlgType;
Buttons: TMsgDlgButtons; DefaultButton: TMsgDlgBtn;
var cbDontAskAnymore: Boolean;
const Title: string ='Confirmation';
const CBMsg: string = 'Don''t ask anymore'): integer;
var
f: TForm;
c: TCheckbox;
begin
f := MsgDlgWithCB(Msg,Title,CBMsg,DlgType,Buttons,DefaultButton,c);
try
result := f.ShowModal;
cbDontAskAnymore := c.Checked;
finally
f.free;
end;
end;
You can use our Open Source SynTaskDialog unit.
Windows provides a generic task dialog available since Vista/Seven. But there is none available with previous versions of Windows, i.e. Windows XP or 2K.
This unit (licensed under a MPL/GPL/LGPL tri-license) will use the new TaskDialog API under Vista/Seven, and emulate it with pure Delphi code and standard themed VCL components under XP or 2K. It supports Delphi 6 up to XE4, and is Win32/Win64 Unicode ready.
Here is the result under a Windows Seven 64 bit computer:
And here is the same dialog created from our emulated pure Delphi code:
Since this screenshot was made on a Win 7 machine, the styling is native for that OS. When the emulated version of the dialog runs on XP it displays in a style native to that OS.
You have your "Do not ask for this setting next time" checkbox... and potentially much more!
The system native functionality that offers such facilities is the task dialog API introduced in Vista. This provides means for you to show much more capable dialogs than the older MessageBox API.
Should you need to support XP then you will have to create your own dialog. For example by deriving from TForm and calling ShowModal. If you do this, make the form capable of building itself dynamically. Don't make one form per message that you show!
In my codebase, I have my own wrapper of the task dialog API. This detects at runtime versions of Windows that do not support task dialog and falls back on a custom built Delphi dialog.
Regarding SHMessageBoxCheck I'd be a little wary of taking a dependency on that. According to its documentation it's not supported beyond XP, and you have to import it by ordinal. I'd personally be worried that it might be dropped from a future version of Windows. That said, MS has a strong track record of doing whatever it takes to keep legacy apps working with new OS releases.
I am trying to tidy up my code now that Delphi XE2 is available - my code dates from Borland Pascal 7 so there are lots of 'old' (but working!) Win32 techniques and natually I have platform independence in mind too. Support for the mouse wheel has come up before here with several prior questions 1 2 and 3. As with some of these answers, my own solution is a simple mouse message intercept using a TApplicationEvents component:
procedure TForm6.ApplicationEvents1Message(var Msg: tagMSG;
var Handled: Boolean);
procedure ProcessMouseWheelMessage;
begin
Msg.message := WM_KEYDOWN;
Msg.lParam := 0;
If Integer(Msg.wParam) > 0 then
Msg.wParam := VK_UP
else
Msg.wParam := VK_DOWN;
Handled := False;
end;
begin
Case Msg.message of
WM_MOUSEWHEEL :
ProcessMouseWheelMessage;
end;
end;
I revisited this code today because 'Msg.wParam' is now NativeInt, breaking use of negative Msg.wParam values in the above code unless you use Integer(Msg.wParam). It made me notice that I had not seen any really definitive use of the mouse wheel for Delphi code - terrible when all mice now have wheels and Delphi is at the 'cutting edge' again! I would have expected a property, a component or some other more 'exposed' solution, and what about Fire Monkey wheel support?
Do I carry on with my solution or is there a better way?
In XE2 (and indeed all the recent releases) you don't need to do anything. The standard controls support mouse wheel scrolling out of the box. Just get rid of this old code.
Delphi components that have a Windows handle (descendents of TWinControl) have the OnMouseWheel, OnMouseWheelUp and OnMouseWheelDown events.
If you want to add a mousewheel event to a control that does not descent from TWinControl, see this article: http://delphi.about.com/od/delphitips2010/qt/timage-handling-mouse-wheel-messages.htm
I'm trying to remake some of my older projects to support Aero Glass. Although it's kinda easy to enable glass frame, I've encountered some major problems. I used this code:
var
xVer: TOSVersionInfo;
hDWM: THandle;
DwmIsCompositionEnabled: function(pbEnabled: BOOL): HRESULT; stdcall;
DwmExtendFrameIntoClientArea: function(hWnd: HWND; const pxMarInset: PRect): HRESULT; stdcall;
bEnabled: BOOL;
xFrame: TRect;
// ...
xVer.dwOSVersionInfoSize := SizeOf(TOSVersionInfo);
GetVersionEx(xVer);
if xVer.dwMajorVersion >= 6 then
begin
hDWM := LoadLibrary('dwmapi.dll');
#DwmIsCompositionEnabled := GetProcAddress(hDWM, 'DwmIsCompositionEnabled');
#DwmExtendFrameIntoClientArea := GetProcAddress(hDWM, 'DwmExtendFrameIntoClientArea');
if (#DwmIsCompositionEnabled <> nil) and
(#DwmExtendFrameIntoClientArea <> nil) then
begin
DwmIsCompositionEnabled(#bEnabled);
if bEnabled then
begin
xRect := Rect(-1, -1, -1, -1);
DwmExtendFrameIntoClientArea(FrmMain.Handle, #xRect);
end;
end;
FreeLibrary(hDWM);
end;
So I got the pretty glass window now. Due to black being transparent color now (kinda stupid choice, why couldn't it be pink) anything that is clBlack becomes transparent, too. It means all labels, edits, button texts... even if I set text to some other color at design time, DWM still makes them that color AND transparent.
Well, my question would be - whether it's possible to solve this somehow?
Delphi 7 and all the versions till D2006 has also other problems with Windows Vista and newer.
Delphi 2007 is the fist certified version for Vista. My advice is to upgrade to Delphi 2010. Your effort to patch Delphi 7 is imho too big for the outcome. Ok, perhaps you will need to convert your application to Unicode (a far less painful process than it sounds - especially if you use Embarcadero's forums and/or this site) but it's worth the effort. And this not only for Vista compatibility but also for all the goodies which are packed with newer versions of Delphi, especially with Delphi 2010.
HTH