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{
fpGUI - Free Pascal GUI Toolkit
Copyright (C) 2006 - 2010 See the file AUTHORS.txt, included in this
distribution, for details of the copyright.
See the file COPYING.modifiedLGPL, included in this distribution,
for details about redistributing fpGUI.
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.
Description:
This unit contains the Message Dialog used throughout fpGUI Toolkit.
}
{%mainunit fpg_dialogs.pas}
{$IFDEF read_interface}
type
TfpgMessageDialog = class(TfpgForm)
private
FInformativeText: TStringList;
FText: string;
FButtons: TfpgMsgDlgButtons;
FDefaultButton: TfpgMsgDlgBtn;
FDialogType: TfpgMsgDlgType;
FButtonList: TList; // pointers to buttons
FMaxLineWidth: Integer;
FFont: TfpgFont;
FTextY: Integer;
FLineHeight: Integer;
function GetInformativeText: string;
procedure SetButtons(const AValue: TfpgMsgDlgButtons);
procedure SetDefaultButton(const AValue: TfpgMsgDlgBtn);
procedure SetInformativeText(const AValue: string);
procedure SetText(const AValue: string);
procedure pnlIconPaint(Sender: TObject);
procedure PrepareIcon;
procedure PrepareText;
procedure PrepareButtons;
protected
procedure SetWindowTitle(const ATitle: string); override;
procedure HandleClose; override;
procedure HandlePaint; override;
procedure HandleShow; override;
procedure HandleKeyPress(var keycode: word; var shiftstate: TShiftState; var consumed: boolean); override;
procedure PrepareLayout;
public
{@VFD_HEAD_BEGIN: fpgMessageDialog}
lblName1: TfpgLabel;
pnlIcon: TfpgBevel;
{@VFD_HEAD_END: fpgMessageDialog}
constructor Create(AOwner: TComponent); override;
destructor Destroy; override;
procedure AfterCreate; override;
class procedure About(const ATitle: string; const AText: string);
class procedure AboutFPGui(const ATitle: string = '');
{ ACloseButton is when the user cancels the dialog via the Esc key or the X window button }
class function Critical(const ATitle: string; const AText: string; AButtons: TfpgMsgDlgButtons = [mbOK]; ADefaultButton: TfpgMsgDlgBtn = mbNoButton; ACloseButton: TfpgMsgDlgBtn = mbCancel): TfpgMsgDlgBtn;
{ ACloseButton is when the user cancels the dialog via the Esc key or the X window button }
class function Information(const ATitle: string; const AText: string; AButtons: TfpgMsgDlgButtons = [mbOK]; ADefaultButton: TfpgMsgDlgBtn = mbNoButton; ACloseButton: TfpgMsgDlgBtn = mbCancel): TfpgMsgDlgBtn;
{ ACloseButton is when the user cancels the dialog via the Esc key or the X window button }
class function Question(const ATitle: string; const AText: string; AButtons: TfpgMsgDlgButtons = [mbYes, mbNo]; ADefaultButton: TfpgMsgDlgBtn = mbNo; ACloseButton: TfpgMsgDlgBtn = mbCancel): TfpgMsgDlgBtn;
{ ACloseButton is when the user cancels the dialog via the Esc key or the X window button }
class function Warning(const ATitle: string; const AText: string; AButtons: TfpgMsgDlgButtons = [mbOK]; ADefaultButton: TfpgMsgDlgBtn = mbNoButton; ACloseButton: TfpgMsgDlgBtn = mbCancel): TfpgMsgDlgBtn;
property InformativeText: string read GetInformativeText write SetInformativeText;
property Text: string read FText write SetText;
property Buttons: TfpgMsgDlgButtons read FButtons write SetButtons;
property DefaultButton: TfpgMsgDlgBtn read FDefaultButton write SetDefaultButton;
property DialogType: TfpgMsgDlgType read FDialogType;
end;
{$ENDIF read_interface}
{$IFDEF read_implementation}
{ TfpgMessageDialog }
procedure TfpgMessageDialog.SetInformativeText(const AValue: string);
var
outw: integer;
begin
if not Assigned(FInformativeText) then
FInformativeText := TStringList.Create;
WrapText(AValue, FInformativeText, FFont, FMaxLineWidth, outw);
// adjust dialog's height
Height := lblName1.Bottom + (FLineHeight*FInformativeText.Count) + FTextY + 35;
end;
procedure TfpgMessageDialog.SetButtons(const AValue: TfpgMsgDlgButtons);
begin
if FButtons = AValue then
Exit; //==>
FButtons := AValue;
end;
function TfpgMessageDialog.GetInformativeText: string;
begin
if Assigned(FInformativeText) then
Result := FInformativeText.Text
else
Result := '';
end;
procedure TfpgMessageDialog.SetDefaultButton(const AValue: TfpgMsgDlgBtn);
begin
if FDefaultButton = AValue then
Exit; //==>
FDefaultButton := AValue;
// Remember to check if button exists in FButtons
end;
procedure TfpgMessageDialog.SetText(const AValue: string);
begin
if FText = AValue then
Exit; //==>
FText := AValue;
lblName1.Text := FText;
end;
procedure TfpgMessageDialog.pnlIconPaint(Sender: TObject);
var
wg: TfpgBevel;
begin
wg := TfpgBevel(Sender);
wg.Visible := False;
end;
procedure TfpgMessageDialog.PrepareIcon;
begin
// do nothing yet
end;
procedure TfpgMessageDialog.PrepareText;
begin
{ todo: Implement this correctly }
// Height := 150;
end;
procedure TfpgMessageDialog.PrepareButtons;
const
cSpacing = 4;
var
i: integer;
b: TfpgButton;
lcount: integer;
lwidth: integer;
ltop: integer;
lleft: integer;
sl: TStringList;
lDefault: integer;
function GetButtonCount: integer;
var
i: TfpgMsgDlgBtn;
begin
Result := 0;
// try known sets first
if Buttons = mbYesNoCancel then
begin
{ TODO : At some stage the StyleManager can give us the correct button
order based on the OS and Window Manager. }
Result := 3;
sl.Add(cMsgDlgBtnText[mbYes] + '=' + IntToStr(Integer(mrYes)));
sl.Add(cMsgDlgBtnText[mbNo] + '=' + IntToStr(Integer(mrNo)));
sl.Add(cMsgDlgBtnText[mbCancel] + '=' + IntToStr(Integer(mrCancel)));
case DefaultButton of
mbYes: lDefault := 0;
mbNo: lDefault := 1;
mbCancel: lDefault := 2;
end;
Exit; //==>
end;
// if we got here, try all known buttons.
for i := Low(TfpgMsgDlgBtn) to High(TfpgMsgDlgBtn) do
begin
if i in Buttons then
begin
inc(Result);
{ TODO : How could we improve this to stay in sync with TfpgModalResult values
like mrOK, mrCancel etc... }
sl.Add(cMsgDlgBtnText[i] + '=' + IntToStr(Ord(i)));
if i = DefaultButton then
lDefault := Result-1;
end;
end;
end;
begin
sl := TStringList.Create; // holds button captions
lcount := GetButtonCount;
lwidth := 0;
// create buttons
for i := 0 to lcount-1 do
begin
b := TfpgButton.Create(self);
b.Name := 'DlgButton' + IntToStr(i+1);
b.Text := sl.Names[i];
b.ModalResult := TfpgModalResult(StrToInt(sl.ValueFromIndex[i]));
if (i = lDefault) or (lcount = 1) then
b.Default := True;
FButtonList.Add(b);
lwidth := lwidth + b.Width
end;
lwidth := lwidth + (cSpacing * (lcount-1));
// position buttons
if Assigned(FInformativeText) then
ltop := lblName1.Bottom + 50 + (FLineHeight*FInformativeText.Count) + 15
else
ltop := lblName1.Bottom + 15;
// ltop := Height - TfpgButton(FButtonList[0]).Height - cSpacing;
lleft := (Width - lwidth) div 2;
for i := 0 to lcount-1 do
begin
b := TfpgButton(FButtonList[i]);
b.SetPosition(lleft, ltop, b.Width, b.Height);
lleft := lleft + b.Width + cSpacing;
end;
sl.Free;
end;
procedure TfpgMessageDialog.SetWindowTitle(const ATitle: string);
begin
if ATitle = '' then
begin
case DialogType of
mtAbout: SetWindowTitle(Format(rsAbout, [fpGUIName]));
mtError: SetWindowTitle(rsError);
mtWarning: SetWindowTitle(rsWarning);
mtConfirmation: SetWindowTitle(rsConfirmation);
end;
end
else
inherited SetWindowTitle(ATitle);
end;
procedure TfpgMessageDialog.HandleClose;
begin
if ModalResult = mrNone then // Form was close via the X (window frame) button
ModalResult := mrCancel;
inherited HandleClose;
end;
procedure TfpgMessageDialog.HandlePaint;
var
logo: TfpgImage;
i: integer;
y: integer;
tw: integer;
begin
Canvas.BeginDraw;
inherited HandlePaint;
case FDialogType of
mtAbout:
begin
Canvas.Clear(BackgroundColor);
logo := CreateImage_BMP(@stdimg_fpgui_logo, SizeOf(stdimg_fpgui_logo));
Canvas.SetColor(clBlack);
Canvas.DrawRectangle(12, 12, logo.Width+2, logo.Height+2);
Canvas.DrawImage(13, 13, logo);
logo.free;
end;
mtError:
begin
Canvas.DrawImage(12, 12, fpgImages.GetImage('stdimg.dlg.critical')); // Do NOT localize
end;
mtConfirmation:
begin
Canvas.DrawImage(12, 12, fpgImages.GetImage('stdimg.dlg.help')); // Do NOT localize
end;
mtWarning:
begin
Canvas.DrawImage(12, 12, fpgImages.GetImage('stdimg.dlg.warning')); // Do NOT localize
end;
else
begin // default to Information
Canvas.DrawImage(12, 12, fpgImages.GetImage('stdimg.dlg.info')); // Do NOT localize
end;
end;
// paint informative text
if Assigned(FInformativeText) then
begin
Canvas.SetFont(FFont);
y := FTextY;
for i := 0 to FInformativeText.Count-1 do
begin
// centre text
// tw := FFont.TextWidth(FInformativeText[i]);
// Canvas.DrawString(Width div 2 - tw div 2, y, FInformativeText[i]);
// left align text
if FInformativeText[i] <> '' then
Canvas.DrawString(70, y, FInformativeText[i]);
Inc(y, FLineHeight);
end;
end;
Canvas.EndDraw;
end;
procedure TfpgMessageDialog.HandleShow;
var
i: integer;
begin
inherited HandleShow;
for i := 0 to ComponentCount-1 do
if Components[i] is TfpgButton then
if TfpgButton(Components[i]).Default then
TfpgButton(Components[i]).SetFocus;
end;
procedure TfpgMessageDialog.HandleKeyPress(var keycode: word;
var shiftstate: TShiftState; var consumed: boolean);
begin
if keycode = keyEscape then // Esc cancels the dialog
ModalResult := mrCancel
else
inherited HandleKeyPress(keycode, shiftstate, consumed);
end;
procedure TfpgMessageDialog.PrepareLayout;
begin
PrepareIcon;
PrepareText;
PrepareButtons;
end;
constructor TfpgMessageDialog.Create(AOwner: TComponent);
begin
inherited Create(AOwner);
FButtonList := TList.Create;
FMaxLineWidth := 400;
FFont := fpgGetFont('#Label1');
FTextY := 60;
FLineHeight := FFont.Height + 4;
end;
destructor TfpgMessageDialog.Destroy;
begin
FFont.Free;
FButtonList.Clear;
FButtonList.Free;
FInformativeText.Free;
inherited Destroy;
end;
class procedure TfpgMessageDialog.About(const ATitle: string; const AText: string);
begin
writeln('** Implement TfpgMessageDialog.About');
end;
class procedure TfpgMessageDialog.AboutFPGui(const ATitle: string);
var
dlg: TfpgMessageDialog;
begin
dlg := TfpgMessageDialog.Create(nil);
try
dlg.FDialogType := mtAbout;
if ATitle = '' then
dlg.WindowTitle := Format(rsAbout, [fpGUIName])
else
dlg.WindowTitle := ATitle;
dlg.Buttons := [mbOK];
dlg.DefaultButton := mbOK;
dlg.Text := dlg.WindowTitle;
dlg.InformativeText := LineEnding + LineEnding
+ 'This program uses ' + fpGUIName + ' version ' + fpGUI_Version + '.'
+ LineEnding + LineEnding
+ fpGUIName + ' is intended for Open Source and Commercial applications. fpGUI '
+ 'uses the LGPL 2 license with a static linking exception - the same as the Free '
+ 'Pascal Compiler''s RTL.'
+ LineEnding + LineEnding
+ 'fpGUI is an Object Pascal toolkit for cross-platform application development. '
+ 'It provides single-source portability across Linux, MS Windows, *BSD '
+ 'OpenSolaris and embedded operating systems like Embedded Linux and Windows CE.'
+ LineEnding + LineEnding
+ 'For more information, see the ' + fpGUIName + ' website at: '
+ fpGUIWebsite;
dlg.PrepareLayout;
dlg.ShowModal;
finally
dlg.Free;
end;
end;
class function TfpgMessageDialog.Critical(const ATitle: string;
const AText: string; AButtons: TfpgMsgDlgButtons;
ADefaultButton: TfpgMsgDlgBtn; ACloseButton: TfpgMsgDlgBtn): TfpgMsgDlgBtn;
var
dlg: TfpgMessageDialog;
mr: TfpgModalResult;
begin
dlg := TfpgMessageDialog.Create(nil);
try
dlg.FDialogType := mtError;
dlg.FButtons := AButtons;
dlg.Text := ATitle;
dlg.InformativeText := AText;
dlg.WindowTitle := ATitle;
dlg.FDefaultButton := ADefaultButton;
dlg.PrepareLayout;
mr := dlg.ShowModal;
// if there is a Cancel button, ignore ACloseButton.
if (mr = mrCancel) and (not (mbCancel in AButtons)) then
Result := ACloseButton
else
Result := TfpgMsgDlgBtn(mr);
finally
dlg.Free;
end;
end;
class function TfpgMessageDialog.Information(const ATitle: string;
const AText: string; AButtons: TfpgMsgDlgButtons;
ADefaultButton: TfpgMsgDlgBtn; ACloseButton: TfpgMsgDlgBtn): TfpgMsgDlgBtn;
var
dlg: TfpgMessageDialog;
mr: TfpgModalResult;
begin
dlg := TfpgMessageDialog.Create(nil);
try
dlg.FDialogType := mtInformation;
dlg.FButtons := AButtons;
dlg.Text := ATitle;
dlg.InformativeText := AText;
dlg.WindowTitle := ATitle;
dlg.FDefaultButton := ADefaultButton;
dlg.PrepareLayout;
mr := dlg.ShowModal;
// if there is a Cancel button, ignore ACloseButton.
if (mr = mrCancel) and (not (mbCancel in AButtons)) then
Result := ACloseButton
else
Result := TfpgMsgDlgBtn(mr);
finally
dlg.Free;
end;
end;
class function TfpgMessageDialog.Question(const ATitle: string;
const AText: string; AButtons: TfpgMsgDlgButtons;
ADefaultButton: TfpgMsgDlgBtn; ACloseButton: TfpgMsgDlgBtn): TfpgMsgDlgBtn;
var
dlg: TfpgMessageDialog;
mr: TfpgModalResult;
begin
dlg := TfpgMessageDialog.Create(nil);
try
dlg.FDialogType := mtConfirmation;
dlg.FButtons := AButtons;
dlg.Text := ATitle;
dlg.InformativeText := AText;
dlg.WindowTitle := ATitle;
dlg.FDefaultButton := ADefaultButton;
dlg.PrepareLayout;
mr := dlg.ShowModal;
// if there is a Cancel button, ignore ACloseButton.
if (mr = mrCancel) and (not (mbCancel in AButtons)) then
Result := ACloseButton
else
Result := TfpgMsgDlgBtn(mr);
finally
dlg.Free;
end;
end;
class function TfpgMessageDialog.Warning(const ATitle: string;
const AText: string; AButtons: TfpgMsgDlgButtons;
ADefaultButton: TfpgMsgDlgBtn; ACloseButton: TfpgMsgDlgBtn): TfpgMsgDlgBtn;
var
dlg: TfpgMessageDialog;
mr: TfpgModalResult;
begin
dlg := TfpgMessageDialog.Create(nil);
try
dlg.FDialogType := mtWarning;
dlg.FButtons := AButtons;
dlg.Text := ATitle;
dlg.InformativeText := AText;
dlg.WindowTitle := ATitle;
dlg.FDefaultButton := ADefaultButton;
dlg.PrepareLayout;
mr := dlg.ShowModal;
// if there is a Cancel button, ignore ACloseButton.
if (mr = mrCancel) and (not (mbCancel in AButtons)) then
Result := ACloseButton
else
Result := TfpgMsgDlgBtn(mr);
finally
dlg.Free;
end;
end;
procedure TfpgMessageDialog.AfterCreate;
begin
{@VFD_BODY_BEGIN: fpgMessageDialog}
Name := 'fpgMessageDialog';
WindowTitle := rsMessage;
Sizeable := False;
Width := 500;
Height := 400;
MinWidth := 300;
MinHeight := 160;
WindowPosition := wpOneThirdDown;
lblName1 := TfpgLabel.Create(self);
with lblName1 do
begin
Name := 'lblName1';
SetPosition(116, 20, 312, Font.Height);
Text := '';
FontDesc := '#Label2';
end;
pnlIcon := TfpgBevel.Create(self);
with pnlIcon do
begin
Name := 'pnlIcon';
SetPosition(12, 12, 80, 80);
Shape := bsSpacer;
OnPaint := @pnlIconPaint;
end;
{@VFD_BODY_END: fpgMessageDialog}
end;
{$ENDIF read_implementation}
|