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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.Text.SingleLine;
interface
uses
Alignment,
Boolean,
Character,
Drawing.Canvas,
Drawing.Fill,
Drawing.Resource,
Event,
FloatingPoint._64,
Font,
Geometry._2d.FloatingPoint64.Rectangle,
Geometry._2d.Integer32.Rectangle,
Geometry._2d.Integer32.Size,
Integer._32,
Integer._32.Interval,
Text,
Text.Value,
Timer,
UserInterface.Control,
UserInterface.Control.Value,
UserInterface.Keyboard.Event,
UserInterface.Keyboard.Modifiers,
UserInterface.Mouse.Event,
UserInterface.Navigation;
type
TSingleLineTextControl = class(TValueControl<TTextValue>)
private
FText: TText;
FHorizontalAlignment: THorizontalAlignment deprecated; // TODO: Alignment should be handled by an embellishing control
FSelectionStart: TInteger32;
FSelectionLength: TInteger32;
FMaximumLength: TInteger32;
FInsert: TBoolean;
FFont: TSizedFont;
FFill: TFill;
FConsumeHorizontalNavigation: TBoolean;
FLayout: TTextLayout;
FLineHeight: TFloatingPoint64;
FViewportOffset: TInteger32;
procedure SetText(const Value: TText);
function GetFont(): TSizedFont;
procedure SetFont(const Value: TSizedFont);
procedure SetFill(const Value: TFill);
procedure SetLayout(const Value: TTextLayout);
procedure SetLineHeight(const Value: TFloatingPoint64);
procedure SetSelectionStart(const Value: TInteger32);
procedure SetSelectionLength(const Value: TInteger32);
procedure SetSelectedText(const Value: TText);
function GetSelectedText(): TText;
procedure SetInsert(const Value: TBoolean);
procedure SetHorizontalAlignment(const Value: THorizontalAlignment);
procedure SetViewportOffset(const Value: TInteger32);
function GetSelectionRange(): TInteger32Interval;
private
LayoutBox: T2dFloatingPoint64Rectangle;
StartEditingTimer: TLowResolutionSynchronousTimer;
procedure UpdateTextValue();
function GetCaretIndex(): TInteger32;
function GetCaretBounds(): TInteger32Rectangle;
procedure PlaceCaret();
procedure ScrollCaretIntoView();
function StartOfWordLeft(Start: TInteger32): TInteger32;
function StartOfWordRight(Start: TInteger32): TInteger32;
function EndOfWord(Start: TInteger32): TInteger32;
function CalculateGoLeftLength(KeyModifiers: TKeyModifiers): TInteger32;
function CalculateGoRightLength(KeyModifiers: TKeyModifiers): TInteger32;
procedure UpdateLayout();
procedure ValidateViewportOffset();
protected
procedure HasBeenBoundToLayout(); override;
procedure ValueUpdated(); override;
function GoLeft(KeyModifiers: TKeyModifiers): TBoolean; override;
function GoRight(KeyModifiers: TKeyModifiers): TBoolean; override;
function GoHorizontalHome(KeyModifiers: TKeyModifiers): TBoolean; override;
function GoHorizontalEnd(KeyModifiers: TKeyModifiers): TBoolean; override;
procedure BoundsChanged(const OldBounds: TInteger32Rectangle; const NewBounds: TInteger32Rectangle); override;
function HandleEnter(KeyModifiers: TKeyModifiers): TBoolean; virtual;
function HandleBackspace(KeyModifiers: TKeyModifiers): TBoolean; virtual;
function HandleDelete(KeyModifiers: TKeyModifiers): TBoolean; virtual;
function HandleInsert(KeyModifiers: TKeyModifiers): TBoolean; virtual;
function GetTextToPaint(): TText; virtual;
procedure TextChanged(); virtual;
function CalculateSizeForLayout(Layout: TTextLayout): TInteger32Size;
procedure UpdateToModel();
property Layout: TTextLayout read FLayout write SetLayout;
property ViewportOffset: TInteger32 read FViewportOffset write SetViewportOffset; // TODO: We should actually embellish this control with a TViewportOnlyScrollPanel
public
constructor Create(); override;
destructor Destroy(); override;
function HandleEvent(Event: TEvent): TBoolean; override;
procedure Paint(Canvas: TCanvas); override;
function Embellish(): TControl; override;
function GetPreferredSize(AvailableSize: TInteger32Size): TInteger32Size; override;
procedure SelectAll(); override;
function CopyToClipboard(): TBoolean; override;
function CutToClipboard(): TBoolean; override;
function PasteFromClipboard(): TBoolean; override;
function KeyDown(Event: TKeyDownEvent): TBoolean; override;
function KeyPress(Event: TKeyPressEvent): TBoolean; override;
function HandlesNavigationDimension(NavigationDimension: TValidNavigationDimension): TBoolean; override;
function MouseLeftDown(Event: TMouseButtonEvent): TBoolean; override;
function MouseMove(Event: TMouseMoveEvent): TBoolean; override;
function StopEditing(Successful: TBoolean): TBoolean; override;
function CanStartEditingForKey(Character: TCharacterCodePoint; KeyModifiers: TKeyModifiers): TBoolean;
procedure SelectNone();
procedure SelectCurrentWord();
function CalculateSizeFor(const Value: TText): TInteger32Size;
property Text: TText read FText write SetText;
property Font: TSizedFont read GetFont write SetFont;
property LineHeight: TFloatingPoint64 read FLineHeight write SetLineHeight;
property Fill: TFill read FFill write SetFill;
property HorizontalAlignment: THorizontalAlignment read FHorizontalAlignment write SetHorizontalAlignment;
property SelectionStart: TInteger32 read FSelectionStart write SetSelectionStart;
property SelectionLength: TInteger32 read FSelectionLength write SetSelectionLength;
property SelectedText: TText read GetSelectedText write SetSelectedText;
property Insert: TBoolean read FInsert write SetInsert;
property MaximumLength: TInteger32 read FMaximumLength write FMaximumLength;
property ConsumeHorizontalNavigation: TBoolean read FConsumeHorizontalNavigation write FConsumeHorizontalNavigation;
public
class function CreateCaptionControl(const Value: TText): TSingleLineTextControl;
end;
implementation
uses
Character.Condition,
Character.Encoding,
Character.Set_.Unicode,
Color,
Color.Constants,
Exception,
Exception.Enumeration,
FloatingPoint._64.Interval,
Font.Purpose,
Geometry._2d.Dimension,
Geometry._2d.FloatingPoint64.Point,
Geometry._2d.Integer32.Point,
Integer.Interval,
Iterator,
Mathematics,
UserInterface.ClipBoard,
UserInterface.Control.Border,
UserInterface.Control.Caret,
UserInterface.Control.FocusIndicating,
UserInterface.Control.Margin,
UserInterface.Control.Mode,
UserInterface.Keyboard.Key,
Value.Unknown;
{ TSingleLineTextControl }
constructor TSingleLineTextControl.Create();
begin
inherited Create();
Font := TPurposeFont.WindowText;
Fill := TFill.Create(TNamedColor.Black);
FInsert := True;
FMaximumLength := -1;
FConsumeHorizontalNavigation := True;
Focusability := TFocusability.Focusable;
Mode := TControlMode.Display;
StartEditingTimer := TLowResolutionSynchronousTimer.Create();
StartEditingTimer.Delay_Milliseconds := 500;
end;
class function TSingleLineTextControl.CreateCaptionControl(const Value: TText): TSingleLineTextControl;
begin
Result := TSingleLineTextControl.Create();
Result.AllowedModes := [TControlMode.Display];
Result.Focusability := TFocusability.None;
Result.Text := Value;
end;
procedure TSingleLineTextControl.PlaceCaret();
begin
Caret := TCaret.Create(GetCaretBounds().Offset(TInteger32Point.New(-ViewportOffset, 0)));
end;
procedure TSingleLineTextControl.SetSelectionStart(const Value: TInteger32);
begin
FSelectionStart := TIntegerInterval.New(0, Text.Count).RestrictValue(Value);
Invalidate();
end;
procedure TSingleLineTextControl.SetText(const Value: TText);
var
NewText: TText;
begin
NewText := Value;
if (MaximumLength <> -1) and (NewText.Count > MaximumLength) then
NewText := NewText.Left(MaximumLength);
if NewText <> Text then
begin
FText := NewText;
UpdateLayout();
Invalidate();
TextChanged();
end;
end;
procedure TSingleLineTextControl.SetViewportOffset(const Value: TInteger32);
begin
if Value <> ViewportOffset then
begin
FViewportOffset := Value;
Invalidate();
end;
end;
procedure TSingleLineTextControl.SetSelectionLength(const Value: TInteger32);
begin
FSelectionLength := Value;
if SelectionStart + FSelectionLength > Text.Count then
FSelectionLength := Text.Count - SelectionStart;
if SelectionStart + FSelectionLength < 0 then
FSelectionLength := -SelectionStart;
Invalidate();
end;
procedure TSingleLineTextControl.SetSelectedText(const Value: TText);
var
BeforeSelection: TText;
AfterSelection: TText;
TemporaryText: TText;
SelectionRange: TInteger32Interval;
begin
SelectionRange := GetSelectionRange();
BeforeSelection := Text.SubtextTo(SelectionRange.Low - 1);
AfterSelection := Text.SubtextFrom(SelectionRange.High);
if not Insert and (SelectionLength = 0) then
AfterSelection := AfterSelection.SubtextFrom(1);
TemporaryText := BeforeSelection + Value + AfterSelection;
if (MaximumLength = -1) or (TemporaryText.Count <= MaximumLength) then
begin
Text := TemporaryText;
SelectionStart := SelectionRange.Low + Value.Count;
SelectionLength := 0;
end;
end;
function TSingleLineTextControl.GetSelectedText(): TText;
var
SelectionRange: TInteger32Interval;
begin
SelectionRange := GetSelectionRange();
Result := Layout.Text.Subtext(SelectionRange.Low, SelectionRange.High - SelectionRange.Low);
end;
function TSingleLineTextControl.GetSelectionRange(): TInteger32Interval;
begin
if SelectionLength >= 0 then
Result := TInteger32Interval.New(SelectionStart, SelectionStart + SelectionLength)
else
Result := TInteger32Interval.New(SelectionStart + SelectionLength, SelectionStart);
end;
procedure TSingleLineTextControl.SetInsert(const Value: TBoolean);
begin
if (Mode = TControlMode.Edit) and (Value <> Insert) then
begin
FInsert := Value;
Invalidate();
end;
end;
procedure TSingleLineTextControl.SetLayout(const Value: TTextLayout);
begin
if Value <> Layout then
begin
FLayout.Free();
FLayout := Value;
end;
end;
procedure TSingleLineTextControl.SetLineHeight(const Value: TFloatingPoint64);
begin
if Value <> LineHeight then
begin
FLineHeight := Value;
UpdateLayout();
end;
end;
procedure TSingleLineTextControl.SelectAll();
begin
SelectionStart := 0;
SelectionLength := Text.Count;
end;
procedure TSingleLineTextControl.SelectNone();
begin
SelectionStart := 0;
SelectionLength := 0;
end;
function TSingleLineTextControl.MouseLeftDown(Event: TMouseButtonEvent): TBoolean;
var
Count: TInteger32;
begin
Result := True;
Count := Event.Count mod 3;
StartEditingTimer.Kill();
if Count in [2, 0] then
begin
case Mode of
TControlMode.Edit:
if Count = 2 then
SelectCurrentWord()
else
SelectAll();
TControlMode.Display:
FireDefaultActionExecuted()
else
raise EUnknownEnumerationValue.Create('Unknown control mode');
end;
end
else
begin
case Mode of
TControlMode.Edit:
begin
if not IsEditor then
RequestFocus();
GetMouseManager().ControlWithCapture := Self;
SelectionStart := Layout.GetTextPosition(T2dFloatingPoint64Point.New(Event.Position.X + ViewportOffset - LayoutBox.Left, Event.Position.Y));
SelectionLength := 0;
Invalidate();
end;
TControlMode.Display:
begin
if not IsEditor and HasFocus and (TControlMode.Edit in AllowedModes) then
StartEditingTimer.Schedule(Self)
else if not IsEditor then
RequestFocus()
else
Result := False;
end
else
raise EUnknownEnumerationValue.Create('Unknown control mode');
end;
end;
end;
function TSingleLineTextControl.MouseMove(Event: TMouseMoveEvent): TBoolean;
begin
Result := IsMouseLeftDown();
if Result then
begin
SelectionLength := Layout.GetTextPosition(T2dFloatingPoint64Point.New(Event.Position.X + ViewportOffset - LayoutBox.Left, Event.Position.Y)) - SelectionStart;
Invalidate();
end;
end;
function TSingleLineTextControl.StartOfWordLeft(Start: TInteger32): TInteger32;
var
Iterator: TIterator<TCharacterCodePoint>;
Index: TInteger32;
StopAt: TInteger32;
begin
StopAt := Minimum(Start, Text.Count);
Result := 0;
Index := 0;
Iterator := Text.CreateIterator();
try
while Iterator.IsValid and (Index < StopAt) do
begin
while Iterator.IsValid and TCharacterCondition.WhiteSpace.Matches(Iterator.Current) and (Index < StopAt) do
begin
Inc(Index);
Iterator.GotoNext();
end;
if Iterator.IsValid and not TCharacterCondition.WhiteSpace.Matches(Iterator.Current) and (Index < StopAt) then
Result := Index;
while Iterator.IsValid and not TCharacterCondition.WhiteSpace.Matches(Iterator.Current) and (Index < StopAt) do
begin
Inc(Index);
Iterator.GotoNext();
end;
end;
finally
Iterator.Free();
end;
end;
function TSingleLineTextControl.StartOfWordRight(Start: TInteger32): TInteger32;
var
Iterator: TIterator<TCharacterCodePoint>;
Index: TInteger32;
begin
Iterator := Text.CreateIterator();
try
for Index := 1 to Start do
Iterator.GotoNext();
Result := Start;
while Iterator.IsValid and not TCharacterCondition.WhiteSpace.Matches(Iterator.Current) do
begin
Iterator.GotoNext();
Inc(Result);
end;
while Iterator.IsValid and TCharacterCondition.WhiteSpace.Matches(Iterator.Current) do
begin
Iterator.GotoNext();
Inc(Result);
end;
finally
Iterator.Free();
end;
end;
function TSingleLineTextControl.StopEditing(Successful: TBoolean): TBoolean;
begin
if Successful then
UpdateToModel()
else
UpdateFromModel();
Result := inherited StopEditing(Successful);
if Result then
ViewportOffset := 0;
end;
function TSingleLineTextControl.HandleDelete(KeyModifiers: TKeyModifiers): TBoolean;
begin
case Mode of
TControlMode.Display:
begin
Result := (TControlMode.Edit in AllowedModes) and (KeyModifiers = []);
if Result then
begin
if Text.Count > 0 then
begin
SelectAll();
SelectedText := '';
UpdateToModel();
FireValueChanged();
Invalidate();
end;
end;
end;
TControlMode.Edit:
begin
Result := True;
if SelectionLength <> 0 then
SelectedText := ''
else if SelectionStart < Text.Count then
begin
SelectionLength := CalculateGoRightLength(KeyModifiers);
SelectedText := '';
end;
Invalidate();
end;
else
raise EUnknownEnumerationValue.Create('Unknown control mode');
end;
end;
function TSingleLineTextControl.HandleBackspace(KeyModifiers: TKeyModifiers): TBoolean;
begin
Result := Mode = TControlMode.Edit;
if Result then
begin
if SelectionLength <> 0 then
SelectedText := ''
else if SelectionStart > 0 then
begin
SelectionLength := CalculateGoLeftLength(KeyModifiers);
SelectedText := '';
end;
Invalidate();
end;
end;
function TSingleLineTextControl.GoLeft(KeyModifiers: TKeyModifiers): TBoolean;
begin
Result := (Mode = TControlMode.Edit) and (ConsumeHorizontalNavigation or (SelectionLength <> 0) or (SelectionStart > 0));
if Result then
begin
if TKeyModifier.Shift in KeyModifiers then
SelectionLength := SelectionLength + CalculateGoLeftLength(KeyModifiers)
else
begin
SelectionStart := SelectionStart + SelectionLength + CalculateGoLeftLength(KeyModifiers);
SelectionLength := 0;
end;
Invalidate();
end;
end;
function TSingleLineTextControl.GoRight(KeyModifiers: TKeyModifiers): TBoolean;
begin
Result := (Mode = TControlMode.Edit) and (ConsumeHorizontalNavigation or (SelectionLength <> 0) or (SelectionStart < Text.Count));
if Result then
begin
if TKeyModifier.Shift in KeyModifiers then
SelectionLength := SelectionLength + CalculateGoRightLength(KeyModifiers)
else
begin
SelectionStart := SelectionStart + SelectionLength + CalculateGoRightLength(KeyModifiers);
SelectionLength := 0;
end;
Invalidate();
end;
end;
function TSingleLineTextControl.GoHorizontalEnd(KeyModifiers: TKeyModifiers): TBoolean;
begin
Result := (Mode = TControlMode.Edit) and ConsumeHorizontalNavigation;
if Result then
begin
if TKeyModifier.Shift in KeyModifiers then
SelectionLength := Text.Count - SelectionStart
else
begin
SelectionStart := Text.Count;
SelectionLength := 0;
end;
Invalidate();
end;
end;
function TSingleLineTextControl.GoHorizontalHome(KeyModifiers: TKeyModifiers): TBoolean;
begin
Result := (Mode = TControlMode.Edit) and ConsumeHorizontalNavigation;
if Result then
begin
if TKeyModifier.Shift in KeyModifiers then
SelectionLength := -SelectionStart
else
begin
SelectionStart := 0;
SelectionLength := 0;
end;
Invalidate();
end;
end;
function TSingleLineTextControl.HandleInsert(KeyModifiers: TKeyModifiers): TBoolean;
begin
Result := Mode = TControlMode.Edit;
if Result then
begin
if KeyModifiers = [TKeyModifier.Control] then
CopyToClipboard()
else if KeyModifiers = [TKeyModifier.Shift] then
PasteFromClipboard()
else if KeyModifiers = [] then
Insert := not Insert;
Invalidate();
end;
end;
function TSingleLineTextControl.HandlesNavigationDimension(NavigationDimension: TValidNavigationDimension): TBoolean;
begin
Result := NavigationDimension = TNavigationDimension.Horizontal;
end;
procedure TSingleLineTextControl.HasBeenBoundToLayout();
begin
inherited HasBeenBoundToLayout();
UpdateLayout();
end;
function TSingleLineTextControl.KeyPress(Event: TKeyPressEvent): TBoolean;
begin
Result := False;
if CanStartEditingForKey(Event.Character, Event.Modifiers) then
begin
if (Mode = TControlMode.Edit) or StartEditing() then
begin
SelectedText := TText.NewOfCharacter(TCharacterEncoding.Utf8, Event.Character, 1);
Result := True;
Invalidate();
end;
end;
end;
function TSingleLineTextControl.CopyToClipboard(): TBoolean;
var
ClipBoard: TClipBoard;
begin
ClipBoard := GetClipBoard();
Clipboard.SetAsText(SelectedText);
Result := True;
end;
function TSingleLineTextControl.CutToClipboard(): TBoolean;
begin
CopyToClipboard();
SelectedText := '';
Result := True;
end;
function TSingleLineTextControl.PasteFromClipboard(): TBoolean;
var
ClipBoard: TClipBoard;
begin
ClipBoard := GetClipBoard();
SelectedText := Clipboard.GetAsText();
Result := True;
end;
procedure TSingleLineTextControl.ScrollCaretIntoView();
var
CaretBounds: TInteger32Rectangle;
begin
CaretBounds := GetCaretBounds();
if CaretBounds.Right - ViewportOffset > Width then
ViewportOffset := CaretBounds.Right - Width;
if CaretBounds.Left - ViewportOffset < 0 then
ViewportOffset := CaretBounds.Left;
end;
procedure TSingleLineTextControl.BoundsChanged(const OldBounds: TInteger32Rectangle; const NewBounds: TInteger32Rectangle);
begin
inherited BoundsChanged(OldBounds, NewBounds);
if OldBounds.Size <> NewBounds.Size then
UpdateLayout();
end;
function TSingleLineTextControl.CalculateGoLeftLength(KeyModifiers: TKeyModifiers): TInteger32;
begin
if TKeyModifier.Control in KeyModifiers then
Result := StartOfWordLeft(GetCaretIndex()) - GetCaretIndex()
else
Result := -1;
end;
function TSingleLineTextControl.CalculateGoRightLength(KeyModifiers: TKeyModifiers): TInteger32;
begin
if TKeyModifier.Control in KeyModifiers then
Result := StartOfWordRight(GetCaretIndex()) - GetCaretIndex()
else
Result := 1;
end;
function TSingleLineTextControl.CalculateSizeFor(const Value: TText): TInteger32Size;
var
Layout: TTextLayout;
begin
Layout := GetDrawingResources().CreateTextLayout(Font, Value);
Result := CalculateSizeForLayout(Layout);
Layout.Free();
end;
function TSingleLineTextControl.CalculateSizeForLayout(Layout: TTextLayout): TInteger32Size;
begin
Result := TInteger32Size.New(RoundUp(Maximum(5, Layout.Size.Width)), RoundUp(LineHeight));
end;
function TSingleLineTextControl.CanStartEditingForKey(Character: TCharacterCodePoint; KeyModifiers: TKeyModifiers): TBoolean;
begin
Result := not TCharacterCondition.Control.Matches(Character) and not ((Character = TUnicode.SPACE) and (KeyModifiers = [TKeyModifier.Control]));
end;
function TSingleLineTextControl.GetCaretBounds(): TInteger32Rectangle;
var
CaretIndex: TInteger32;
Metrics: TTextPositionMetrics;
begin
CaretIndex := GetCaretIndex();
Metrics := Layout.GetMetricsForTextPosition(CaretIndex);
if Insert then
Result := TInteger32Rectangle.New(
(Metrics.CaretPosition + LayoutBox.TopLeft).RoundToNearest(),
TInteger32Size.New(1, RoundToNearest(Metrics.Bounds.Height))
)
else
Result := Metrics.Bounds.Offset(LayoutBox.TopLeft).RoundToNearest();
end;
function TSingleLineTextControl.GetCaretIndex(): TInteger32;
begin
Result := SelectionStart + SelectionLength;
end;
destructor TSingleLineTextControl.Destroy();
begin
Layout.Free();
StartEditingTimer.Free();
Fill.ReleaseReference();
inherited Destroy();
end;
procedure TSingleLineTextControl.SelectCurrentWord();
var
Left: TInteger32;
Right: TInteger32;
begin
Left := StartOfWordLeft(GetCaretIndex() + 1);
Right := EndOfWord(Left);
SelectionStart := Left;
SelectionLength := Right - Left;
end;
function TSingleLineTextControl.EndOfWord(Start: TInteger32): TInteger32;
var
Cursor: TTextCursor;
begin
Cursor := Text.CreateCursor();
try
Cursor.Skip(Start);
Result := Start;
while not Cursor.AtEnd and not TCharacterCondition.WhiteSpace.Matches(Cursor.Read()) do
Inc(Result);
finally
Cursor.Free();
end;
end;
procedure TSingleLineTextControl.TextChanged();
begin
end;
function TSingleLineTextControl.GetTextToPaint(): TText;
begin
Result := Text;
end;
procedure TSingleLineTextControl.Paint(Canvas: TCanvas);
var
SelectionRange: TInteger32Interval;
SelectionBounds: TInteger32Rectangle;
begin
ScrollCaretIntoView(); // TODO: Scrolling caret into view should not be done here, but at locations where the caret is updated
Canvas.Font := Font;
Canvas.Transformation.AppendTranslation(T2dFloatingPoint64Point.New(-ViewportOffset, 0));
try
case Mode of
TControlMode.Display:
begin
Caret := nil;
Canvas.Fill := Fill;
Canvas.FillTextLayout(LayoutBox.TopLeft, Layout);
if Layout.Size.Width > Width then
Canvas.OverlayGradient(
TInteger32Rectangle.New(Width - 12, 0, Width - 1, Height - 1),
TNamedColor.White,
TFloatingPoint64Interval.New(0, 0.7),
T2dDimension.Horizontal
);
end;
TControlMode.Edit:
begin
PlaceCaret();
SelectionRange := GetSelectionRange();
if SelectionRange.Low <> SelectionRange.High then
begin
SelectionBounds := Layout.GetBoundsForTextRange(SelectionRange).RoundToNearest();
Canvas.Fill := TFill.Create(SelectionColor(ReceivesKeyboardInput));
Canvas.OverlayRectangle(SelectionBounds.Offset(LayoutBox.TopLeft.RoundToNearest()), 1);
end;
Canvas.Fill := Fill;
Canvas.FillTextLayout(LayoutBox.TopLeft, Layout);
end
else
raise EUnknownEnumerationValue.Create('Unknown display mode');
end;
finally
Canvas.Transformation.RemoveLast();
end;
end;
function TSingleLineTextControl.KeyDown(Event: TKeyDownEvent): TBoolean;
begin
Result := inherited KeyDown(Event);
if not Result then
begin
case Event.Key of
TKey.Insert:
Result := HandleInsert(Event.Modifiers);
TKey.Delete:
Result := HandleDelete(Event.Modifiers);
TKey.Backspace:
Result := HandleBackspace(Event.Modifiers);
TKey.Enter:
Result := HandleEnter(Event.Modifiers);
TKey.Escape:
Result := HandleEscape(Event.Modifiers);
end;
end;
end;
function TSingleLineTextControl.GetFont(): TSizedFont;
begin
Result := FFont;
end;
procedure TSingleLineTextControl.SetFill(const Value: TFill);
begin
if Value <> Fill then
begin
Value.AddReference();
Fill.ReleaseReference();
FFill := Value;
Invalidate();
end;
end;
procedure TSingleLineTextControl.SetFont(const Value: TSizedFont);
begin
if Value <> Font then
begin
FFont := Value;
UpdateLayout();
end;
end;
procedure TSingleLineTextControl.SetHorizontalAlignment(const Value: THorizontalAlignment);
begin
if Value <> HorizontalAlignment then
begin
FHorizontalAlignment := Value;
UpdateLayout();
end;
end;
procedure TSingleLineTextControl.UpdateLayout();
var
Resources: TDrawingResources;
Left: TInteger32;
begin
if IsBoundToLayout() then
begin
Resources := GetDrawingResources();
FLineHeight := Resources.GetFontMetrics(Font).CalculateLineHeight();
Layout := Resources.CreateTextLayout(Font, GetTextToPaint());
case HorizontalAlignment of
THorizontalAlignment.Left:
Left := 0;
THorizontalAlignment.Right:
Left := Maximum(0, Width - RoundToNearest(Layout.Size.Width) - 1);
THorizontalAlignment.Middle:
Left := Maximum(0, (Width - RoundToNearest(Layout.Size.Width)) div 2);
else
raise EUnknownEnumerationValue.Create('Unknown horizontal alignment');
end;
LayoutBox := T2dFloatingPoint64Rectangle.New(T2dFloatingPoint64Point.New(Left, Maximum(0, (Height - LineHeight) / 2)), Layout.Size);
ValidateViewportOffset();
end;
end;
procedure TSingleLineTextControl.UpdateTextValue();
begin
if (Value = nil) or (Value is TUnknown) then
Text := ''
else if Value is TTextValue then
Text := (Value as TTextValue).Value
else
raise EException.Create('Unsupported value: ' + Value.ClassName);
end;
procedure TSingleLineTextControl.UpdateToModel();
begin
Model.SetValue(TTextValue.Create(Text));
end;
procedure TSingleLineTextControl.ValidateViewportOffset();
begin
ViewportOffset := TIntegerInterval.New(0, Maximum(0, Width - RoundToNearest(Layout.Size.Width))).RestrictValue(ViewportOffset);
end;
procedure TSingleLineTextControl.ValueUpdated();
begin
inherited ValueUpdated();
UpdateTextValue();
end;
function TSingleLineTextControl.Embellish(): TControl;
var
Border: TControlBorder;
Margin: TControlMargin;
FocusIndicator: TFocusIndicatingControl;
begin
if not IsEditor and (Focusability <> TFocusability.None) then
begin
Margin := TControlMargin.Create();
Margin.Insets := TInteger32Rectangle.New(2, 1, 2, 1);
Margin.Control := Self;
FocusIndicator := TFocusIndicatingControl.Create();
FocusIndicator.Control := Margin;
Border := TControlBorder.Create();
Border.Control := FocusIndicator;
Result := Border;
end
else
Result := Self;
end;
function TSingleLineTextControl.HandleEnter(KeyModifiers: TKeyModifiers): TBoolean;
begin
Result := (Mode in [TControlMode.Edit, TControlMode.Display]) and (KeyModifiers = []);
case Mode of
TControlMode.Display:
FireDefaultActionExecuted();
TControlMode.Edit:
StopEditing(True);
end;
end;
function TSingleLineTextControl.HandleEvent(Event: TEvent): TBoolean;
begin
if (Event is TTimerFired) and (Event.GetSender() = StartEditingTimer) and ReceivesKeyboardInput() then
begin
Result := True;
StartEditing();
end
else
Result := inherited HandleEvent(Event);
end;
function TSingleLineTextControl.GetPreferredSize(AvailableSize: TInteger32Size): TInteger32Size;
begin
Result := CalculateSizeForLayout(Layout);
end;
end.
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