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| ///////////////////////////////////////////////////////////////////////////
// //
// Copyright (c) 2015 by Charta Software B.V. //
// All rights reserved //
// //
// Version: 1.7.0.83525 //
// Web site: https://pascal.chartasoftware.com/ //
// //
// This code and information are provided "as is" without warranty of //
// any kind. Dissemination of this information or reproduction of //
// this material is strictly forbidden unless prior written permission //
// is obtained from Charta Software B.V.. //
// //
///////////////////////////////////////////////////////////////////////////
unit UserInterface.Control.Button;
interface
{$SCOPEDENUMS ON}
uses
Boolean,
Drawing.Canvas,
Event,
Geometry._2d.Integer32.Rectangle,
Geometry._2d.Integer32.Size,
Timer,
UserInterface.Control,
UserInterface.Control.Text.SingleLine,
UserInterface.Keyboard.Event,
UserInterface.Mouse.Event;
type
TButtonBehavior = (PushButton, ToggleButton, RepeatingButton);
TAbstractButton = class(TControl)
private
FDown: TBoolean;
FHot: TBoolean;
FBehavior: TButtonBehavior;
FirstTimer: TLowResolutionSynchronousTimer;
RepeatTimer: TLowResolutionSynchronousTimer;
protected
procedure DownChanged(); virtual;
procedure HotChanged(); virtual;
procedure HandleButtonDown();
procedure HandleButtonUp();
procedure SetDown(const Value: TBoolean);
procedure SetHot(const Value: TBoolean);
procedure SetBehavior(const Value: TButtonBehavior);
procedure AdjustFocusability();
procedure AdjustTimers();
public
constructor Create(); override;
destructor Destroy(); override;
function HandleEvent(Event: TEvent): TBoolean; override;
function KeyDown(Event: TKeyDownEvent): TBoolean; override;
function KeyUp(Event: TKeyUpEvent): TBoolean; override;
function MouseLeftDown(Event: TMouseButtonEvent): TBoolean; override;
function MouseLeftUp(Event: TMouseButtonEvent): TBoolean; override;
function MouseMove(Event: TMouseMoveEvent): TBoolean; override;
function MouseLeave(Event: TMouseLeaveEvent): TBoolean; override;
property Down: TBoolean read FDown write SetDown;
property Hot: TBoolean read FHot write SetHot;
property Behavior: TButtonBehavior read FBehavior write SetBehavior;
end;
TButtonState = (Normal, Pressed, Hot);
TButton = class(TAbstractButton)
private
FState: TButtonState;
FLabelControl: TSingleLineTextControl;
procedure SetState(const Value: TButtonState);
protected
procedure HasBeenBoundToLayout(); override;
procedure CaptionChanged(); override;
procedure BoundsChanged(const OldBounds: TInteger32Rectangle; const NewBounds: TInteger32Rectangle); override;
procedure DownChanged(); override;
procedure HotChanged(); override;
procedure Layout();
function DetermineState(): TButtonState;
function GetCaptionInsets(): TInteger32Rectangle;
function GetPreferredExtraSize(): TInteger32Size;
function CalculateCaptionRectangle(): TInteger32Rectangle;
procedure PaintButton(Canvas: TCanvas; const Bounds: TInteger32Rectangle);
public
constructor Create(); override;
procedure Paint(Canvas: TCanvas); override;
function GetPreferredSize(AvailableSize: TInteger32Size): TInteger32Size; override;
property State: TButtonState read FState write SetState;
property LabelControl: TSingleLineTextControl read FLabelControl;
end;
implementation
uses
Alignment,
Color.Constants,
Drawing.Fill,
Drawing.Stroke,
FloatingPoint._64.Interval,
Font.Purpose,
Geometry._2d.Dimension,
Geometry._2d.FloatingPoint64.Rectangle,
Geometry._2d.FloatingPoint64.Rectangle.Rounded,
Geometry._2d.FloatingPoint64.Size,
Geometry._2d.Integer32.Point,
UserInterface.Control.Mode,
UserInterface.Keyboard.Key;
{ TAbstractButton }
procedure TAbstractButton.AdjustFocusability();
begin
if Behavior = TButtonBehavior.RepeatingButton then
Focusability := TFocusability.None
else
Focusability := TFocusability.Focusable;
end;
procedure TAbstractButton.AdjustTimers;
begin
if Behavior = TButtonBehavior.RepeatingButton then
begin
FirstTimer := TLowResolutionSynchronousTimer.Create();
FirstTimer.Delay_Milliseconds := 500;
RepeatTimer := TLowResolutionSynchronousTimer.Create();
RepeatTimer.Delay_Milliseconds := 50;
end
else
begin
FirstTimer.Free();
RepeatTimer.Free();
FirstTimer := nil;
RepeatTimer := nil;
end;
end;
constructor TAbstractButton.Create();
begin
inherited Create();
AllowedModes := [TControlMode.Display];
Behavior := TButtonBehavior.PushButton;
end;
destructor TAbstractButton.Destroy();
begin
FirstTimer.Free();
RepeatTimer.Free();
inherited Destroy();
end;
procedure TAbstractButton.DownChanged();
begin
end;
procedure TAbstractButton.HandleButtonDown();
begin
case Behavior of
TButtonBehavior.PushButton:
Down := True;
TButtonBehavior.ToggleButton:
begin
Down := not Down;
FireDefaultActionExecuted();
end;
TButtonBehavior.RepeatingButton:
begin
Down := True;
FireDefaultActionExecuted();
FirstTimer.Schedule(Self);
end;
end;
end;
procedure TAbstractButton.HandleButtonUp();
begin
case Behavior of
TButtonBehavior.PushButton:
if Down then
begin
Down := False;
FireDefaultActionExecuted();
end;
TButtonBehavior.RepeatingButton:
begin
Down := False;
FirstTimer.Kill();
RepeatTimer.Kill();
end;
end;
end;
function TAbstractButton.HandleEvent(Event: TEvent): TBoolean;
begin
if Event is TTimerFired then
begin
Result := True;
if Down then
FireDefaultActionExecuted();
RepeatTimer.Schedule(Self);
end
else
Result := inherited HandleEvent(Event);
end;
procedure TAbstractButton.HotChanged();
begin
end;
function TAbstractButton.KeyDown(Event: TKeyDownEvent): TBoolean;
begin
Result := Event.Key = TKey.Space;
if Result then
HandleButtonDown();
end;
function TAbstractButton.KeyUp(Event: TKeyUpEvent): TBoolean;
begin
Result := True;
if Event.Key = TKey.Space then
HandleButtonUp();
end;
function TAbstractButton.MouseLeave(Event: TMouseLeaveEvent): TBoolean;
begin
Result := True;
Hot := False;
end;
function TAbstractButton.MouseLeftDown(Event: TMouseButtonEvent): TBoolean;
begin
Result := True;
GetMouseManager().ControlWithCapture := Self;
HandleButtonDown();
end;
function TAbstractButton.MouseLeftUp(Event: TMouseButtonEvent): TBoolean;
begin
Result := True;
HandleButtonUp();
end;
function TAbstractButton.MouseMove(Event: TMouseMoveEvent): TBoolean;
var
SizeRectangle: TInteger32Rectangle;
begin
Result := False;
if IsMouseLeftDown then
begin
SizeRectangle := Bounds.Size;
Down := SizeRectangle.Contains(Event.Position);
end
else
Hot := True;
end;
procedure TAbstractButton.SetBehavior(const Value: TButtonBehavior);
begin
if Value <> Behavior then
begin
FBehavior := Value;
AdjustFocusability();
AdjustTimers();
end;
end;
procedure TAbstractButton.SetDown(const Value: TBoolean);
begin
if Down <> Value then
begin
FDown := Value;
DownChanged();
Invalidate();
end;
end;
procedure TAbstractButton.SetHot(const Value: TBoolean);
begin
if Value <> Hot then
begin
FHot := Value;
HotChanged();
Invalidate();
end;
end;
{ TButton }
procedure TButton.Paint(Canvas: TCanvas);
var
CaptionRectangle: TInteger32Rectangle;
begin
PaintButton(Canvas, Bounds.Size);
CaptionRectangle := CalculateCaptionRectangle();
if ReceivesKeyboardInput then
PaintFocusRectangle(Canvas, CaptionRectangle.Outset(TInteger32Rectangle.New(1, 1, 1, 1)));
end;
procedure TButton.PaintButton(Canvas: TCanvas; const Bounds: TInteger32Rectangle);
begin
if State = TButtonState.Pressed then
Canvas.Fill := TFill.Create(TPurposeColor.Button.Pressed)
else
Canvas.Fill := TFill.Create(TNamedColor.White);
Canvas.FillRectangle(Bounds);
if State = TButtonState.Hot then
begin
Canvas.Stroke := TStroke.Create(TPurposeColor.Hot, 1);
Canvas.DrawRectangle(TInteger32Rectangle.New(Bounds.Left + 1, Bounds.Top + 1, Bounds.Right - 1, Bounds.Bottom - 1));
Canvas.DrawRectangle(TInteger32Rectangle.New(Bounds.Left + 2, Bounds.Top + 2, Bounds.Right - 2, Bounds.Bottom - 2));
end;
Canvas.Stroke := TStroke.Create(TPurposeColor.DarkControlBorder, 1);
Canvas.DrawRoundedRectangle(T2dFloatingPoint64RoundedRectangle.New(T2dFloatingPoint64Rectangle.New(Bounds), T2dFloatingPoint64Size.NewSquare(1)));
Canvas.OverlayGradient(
TInteger32Rectangle.New(0, Height div 2, Width - 1, Height - 1),
TNamedColor.LightGray,
TFloatingPoint64Interval.New(0.4, 0.05),
T2dDimension.Vertical
);
end;
procedure TButton.SetState(const Value: TButtonState);
begin
if Value <> State then
begin
FState := Value;
Layout();
Invalidate();
end;
end;
procedure TButton.BoundsChanged(const OldBounds: TInteger32Rectangle; const NewBounds: TInteger32Rectangle);
begin
inherited BoundsChanged(OldBounds, NewBounds);
if OldBounds.Size <> NewBounds.Size then
Layout();
end;
function TButton.CalculateCaptionRectangle(): TInteger32Rectangle;
begin
Result := Size;
Result := Result.Inset(GetCaptionInsets());
if State = TButtonState.Pressed then
Result := Result.Offset(TInteger32Point.New(1, 1));
end;
procedure TButton.CaptionChanged();
begin
inherited CaptionChanged();
LabelControl.Text := Caption;
end;
constructor TButton.Create();
begin
inherited Create();
FLabelControl := TSingleLineTextControl.Create();
FLabelControl.AllowedModes := [TControlMode.Display];
FLabelControl.Focusability := TFocusability.None;
FLabelControl.IsEditor := True;
FLabelControl.HorizontalAlignment := THorizontalAlignment.Middle;
FLabelControl.Font := TPurposeFont.Caption;
ChildControls.Add(LabelControl);
end;
function TButton.DetermineState(): TButtonState;
begin
if Down then
Result := TButtonState.Pressed
else if Hot then
Result := TButtonState.Hot
else
Result := TButtonState.Normal;
end;
procedure TButton.DownChanged();
begin
State := DetermineState();
end;
function TButton.GetCaptionInsets(): TInteger32Rectangle;
begin
Result := TInteger32Rectangle.New(4, 4, 5, 5);
end;
function TButton.GetPreferredExtraSize(): TInteger32Size;
begin
Result := TInteger32Size.New(6, 0);
end;
function TButton.GetPreferredSize(AvailableSize: TInteger32Size): TInteger32Size;
var
Insets: TInteger32Rectangle;
InsetsSize: TInteger32Size;
begin
Insets := GetCaptionInsets();
InsetsSize := TInteger32Size.New(Insets.Left + Insets.Right, Insets.Top + Insets.Bottom) + GetPreferredExtraSize();
Result := LabelControl.GetPreferredSize(AvailableSize - InsetsSize) + InsetsSize;
end;
procedure TButton.HasBeenBoundToLayout();
begin
inherited HasBeenBoundToLayout();
Layout();
end;
procedure TButton.HotChanged();
begin
State := DetermineState();
end;
procedure TButton.Layout();
begin
if IsBoundToLayout() then
LabelControl.Bounds := CalculateCaptionRectangle();
end;
end.
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