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unit gui_dialogs;
{$mode objfpc}{$H+}
interface
uses
Classes, SysUtils, fpgfx, gui_form, gui_button, gui_label;
type
{ TfpgMessageBox }
TfpgMessageBox = class(TfpgForm)
private
FLines: TStringList;
FFont: TfpgFont;
FTextY: integer;
FLineHeight: integer;
FMaxLineWidth: integer;
FButton: TfpgButton;
procedure ButtonClick(Sender: TObject);
protected
procedure HandleKeyPress(var keycode: word; var shiftstate: TShiftState; var consumed: boolean); override;
procedure HandlePaint; override;
public
constructor Create(AOwner : TComponent); override;
destructor Destroy; override;
procedure SetMessage(AMessage: string);
end;
procedure ShowMessage(AMessage, ATitle: string); overload;
procedure ShowMessage(AMessage: string); overload;
implementation
uses
gfxbase, gfx_utf8utils;
procedure ShowMessage(AMessage, ATitle: string);
var
frm: TfpgMessageBox;
begin
frm := TfpgMessageBox.Create(nil);
try
frm.WindowTitle := ATitle;
frm.SetMessage(AMessage);
frm.ShowModal;
finally
frm.Free;
end;
end;
procedure ShowMessage(AMessage: string);
begin
ShowMessage(AMessage, 'Message');
end;
{ TfpgMessageBox }
procedure TfpgMessageBox.ButtonClick(Sender: TObject);
begin
ModalResult := 1;
end;
procedure TfpgMessageBox.HandleKeyPress(var keycode: word;
var shiftstate: TShiftState; var consumed: boolean);
begin
inherited HandleKeyPress(keycode, shiftstate, consumed);
if keycode = keyEscape then
Close;
end;
procedure TfpgMessageBox.HandlePaint;
var
n, y: integer;
tw: integer;
begin
Canvas.BeginDraw;
inherited HandlePaint;
// canvas.Clear(FBackgroundColor);
Canvas.SetFont(FFont);
y := FTextY;
for n := 0 to FLines.Count-1 do
begin
tw := FFont.TextWidth(FLines[n]);
Canvas.DrawString(Width div 2 - tw div 2, y, FLines[n]);
Inc(y, FLineHeight);
end;
Canvas.EndDraw;
end;
constructor TfpgMessageBox.Create(AOwner: TComponent);
begin
inherited Create(AOwner);
WindowAttributes := [waAutoPos];
FLines := TStringList.Create;
FFont := fpgGetFont('#Label1');
FTextY := 10;
FLineHeight := FFont.Height + 4;
MinWidth := 200;
FMaxLineWidth := 500;
FButton := TfpgButton.Create(self);
FButton.text := 'OK'; // We must localize this
FButton.Width := 75;
FButton.OnClick := @ButtonClick;
end;
destructor TfpgMessageBox.Destroy;
begin
FFont.Free;
FLines.Free;
inherited Destroy;
end;
procedure TfpgMessageBox.SetMessage(AMessage: string);
var
maxw: integer;
n: integer;
s, s2: string;
c: char;
// -----------------
procedure AddLine(all: boolean);
var
w: integer;
m: integer;
begin
s2 := s;
w := FFont.TextWidth(s2);
if w > FMaxLineWidth then
begin
while w > FMaxLineWidth do
begin
m := UTF8Length(s);
repeat
Dec(m);
s2 := UTF8Copy(s,1,m);
w := FFont.TextWidth(s2);
until w <= FMaxLineWidth;
if w > maxw then
maxw := w;
// are we in the middle of a word. If so find the beginning of word.
while UTF8Copy(s2, m, m+1) <> ' ' do
begin
Dec(m);
s2 := UTF8Copy(s,1,m);
end;
FLines.Add(s2);
s := UTF8Copy(s, m+1, UTF8length(s));
s2 := s;
w := FFont.TextWidth(s2);
end; { while }
if all then
begin
FLines.Add(s2);
s := '';
end;
end
else
begin
FLines.Add(s2);
s := '';
end; { if/else }
if w > maxw then
maxw := w;
end;
begin
s := '';
FLines.Clear;
n := 1;
maxw := 0;
while n <= length(AMessage) do
begin
c := AMessage[n];
if (c = #13) or (c = #10) then
begin
AddLine(false);
if (c = #13) and (n < length(AMessage)) and (AMessage[n+1] = #10) then
Inc(n);
end
else
s := s + c;
Inc(n);
end; { while }
AddLine(true);
// dialog width with 10 pixel border on both sides
Width := maxw + 2*10;
if Width < FMinWidth then
Width := FMinWidth;
// center button
FButton.Top := FTextY + FLineHeight*FLines.Count + FTextY;
FButton.Left := (Width div 2) - (FButton.Width div 2);
// adjust dialog's height
Height := FButton.Top + FButton.Height + FTextY;
end;
end.
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