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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.Navigation;
interface
uses
Boolean,
Drawing.Canvas,
Event,
Integer._32,
Object_.Base,
UserInterface.Control,
UserInterface.Control.Navigation.Action,
UserInterface.Control.Navigation.OverlayControl,
UserInterface.Control.WeakReference,
UserInterface.DragAndDrop.Manager,
UserInterface.Keyboard.Event,
UserInterface.Keyboard.Key,
UserInterface.Mouse.Event,
UserInterface.Navigation,
UserInterface.User.Level;
type
TControlNavigationInfo = record
public
PreviousControl: TControl;
Direction: TNavigationDirection;
end;
TControlNavigationStack = class(TObject)
private
Elements: array of TControlNavigationInfo;
public
function Peek(): TControlNavigationInfo;
function Pop(): TControlNavigationInfo;
procedure Push(Direction: TNavigationDirection; PreviousControl: TControl);
function Count(): TInteger32;
procedure Clear();
end;
TControlNavigationContainerControl = class(TControl)
end;
TControlNavigationManager = class(TBaseObject)
private
FRootControl: TControl;
CurrentReference: TControlWeakReference<TControl>;
OverlayControl: TNavigationOverlayControl;
procedure SetCurrent(const Value: TControl);
function GetCurrent(): TControl;
procedure SetRootControl(const Value: TControl);
protected
function KeyToNavigationAction(Key: TKey): TControlNavigationAction;
function IsInverseNavigation(ControlNavigationInfo: TControlNavigationInfo; Direction: TNavigationDirection): TBoolean;
function NextNavigationControl(CurrentControl: TControl; Direction: TNavigationDirection): TControl;
procedure LayoutControl(NavigationAction: TControlNavigationAction);
procedure HandleNavigationAction(Action: TControlNavigationAction);
procedure DragControl();
procedure PrintScreen();
procedure CloseCurrent();
procedure SetUserLevel(Level: TUserLevel);
procedure NavigateControl(Direction: TNavigationDirection);
function HandleStartEvent(Event: TEvent): TBoolean;
function HandleKeyboardEvent(Event: TKeyboardEvent): TBoolean;
function HandleMouseWheelEvent(Event: TMouseWheelEvent): TBoolean;
procedure UpdateOverlayBounds();
public
ContainerControl: TControlNavigationContainerControl;
FocusManager: TKeyboardFocusManager;
DragAndDropManager: TDragAndDropManager;
IsActive: TBoolean;
History: TControlNavigationStack;
constructor Create(); override;
destructor Destroy(); override;
procedure Start();
procedure Stop(Successful: TBoolean);
function ImmediateNavigateControl(Direction: TNavigationDirection): TBoolean;
function HandleEvent(Event: TEvent): TBoolean; override;
procedure Paint(Canvas: TCanvas);
property Current: TControl read GetCurrent write SetCurrent;
property RootControl: TControl read FRootControl write SetRootControl;
end;
implementation
uses
DateTime,
Exception,
File_,
Geometry._2d.Integer32.Rectangle,
Geometry._2d.Integer32.Size,
Geometry._2d.Side,
Image.Raster,
Image.Raster.Png.Writer,
Stream.Output,
UserInterface.Control.Event,
UserInterface.Control.Navigation.Action.Panel,
UserInterface.Control.Panel.Split,
UserInterface.Control.Panel.Split.SingleDimension.Horizontal,
UserInterface.Control.Panel.Split.SingleDimension.Vertical,
UserInterface.Keyboard.Modifiers,
Windows.Gdi.Bitmap,
Windows.Gdi.Canvas;
{ TControlNavigationManager }
procedure TControlNavigationManager.CloseCurrent();
var
ContainerControl: TControl;
begin
ContainerControl := Current.ParentControl;
ContainerControl.CloseControl(Current);
FocusManager.FocusedControl := ContainerControl.DefaultControlToFocus;
Current := ContainerControl.DefaultControlToNavigate;
end;
constructor TControlNavigationManager.Create();
begin
inherited Create();
CurrentReference := TControlWeakReference<TControl>.Create(Self);
History := TControlNavigationStack.Create();
OverlayControl := TNavigationOverlayControl.Create();
ContainerControl := TControlNavigationContainerControl.Create();
ContainerControl.ChildControls.Add(OverlayControl);
OverlayControl.Listeners.Add(Self);
OverlayControl.ActionPanel.Listeners.Add(Self);
end;
destructor TControlNavigationManager.Destroy();
begin
OverlayControl.ActionPanel.Listeners.Remove(Self);
OverlayControl.Listeners.Remove(Self);
History.Free();
ContainerControl.Free();
CurrentReference.Free();
inherited Destroy();
end;
procedure TControlNavigationManager.DragControl();
var
DragControl: TControl;
begin
DragControl := Current;
Stop(False);
DragAndDropManager.StartDrag(DragControl);
end;
function TControlNavigationManager.GetCurrent(): TControl;
begin
Result := CurrentReference.Value;
end;
function TControlNavigationManager.HandleEvent(Event: TEvent): TBoolean;
begin
Result := IsActive;
if Result then
begin
if (Event is TControlBoundsChangedEvent) and (Event.GetSender() = Current) then
UpdateOverlayBounds()
else if (Event is TControlNavigationActionExecuted) then
HandleNavigationAction((Event as TControlNavigationActionExecuted).Action)
else if Event is TKeyboardEvent then
Result := HandleKeyboardEvent(Event as TKeyboardEvent)
else
begin
if Event is TMouseWheelEvent then
HandleMouseWheelEvent(Event as TMouseWheelEvent)
else if Event is TMouseEvent then
ContainerControl.GetMouseManager().SendEventToControl(ContainerControl, Event as TMouseEvent);
end;
end
else
Result := HandleStartEvent(Event);
end;
function TControlNavigationManager.HandleKeyboardEvent(Event: TKeyboardEvent): TBoolean;
var
StateEvent: TKeyStateEvent;
begin
Result := False;
if Event is TKeyStateEvent then
begin
StateEvent := Event as TKeyStateEvent;
if (StateEvent is TKeyDownEvent) and (StateEvent.Modifiers = [TKeyModifier.Alt]) then
begin
Result := True;
case StateEvent.Key of
TKey.C:
CloseCurrent();
TKey.D:
SetUserLevel(ulDeveloper);
TKey.U:
SetUserLevel(ulEndUser);
TKey.P:
PrintScreen();
TKey.T, TKey.H, TKey.V:
LayoutControl(KeyToNavigationAction(StateEvent.Key));
TKey.Left, TKey.Right, TKey.Up, TKey.Down, TKey.OpenBracket, TKey.CloseBracket:
NavigateControl(KeyToNavigation(StateEvent.Key, []));
TKey.ESCAPE:
Stop(False);
else
Result := False;
end;
end
else if (StateEvent is TKeyUpEvent) and (StateEvent.Key = TKey.Alt) then
Stop(True);
end;
end;
function TControlNavigationManager.HandleMouseWheelEvent(Event: TMouseWheelEvent): TBoolean;
begin
Result := True;
if Event.Delta > 0 then
NavigateControl(TNavigationDirection.Parent)
else
NavigateControl(TNavigationDirection.Child);
end;
procedure TControlNavigationManager.HandleNavigationAction(Action: TControlNavigationAction);
begin
case Action of
cnaClose:
CloseCurrent();
cnaTab, cnaSplitVertical, cnaSplitHorizontal, cnaToggleCaption:
LayoutControl(Action);
cnaDrag:
DragControl();
else
raise EException.Create('Unknown navigation action');
end;
end;
function TControlNavigationManager.HandleStartEvent(Event: TEvent): TBoolean;
begin
Result := (Event is TKeyDownEvent) and ((Event as TKeyDownEvent).Key = TKey.Alt);
if Result then
Start();
end;
function TControlNavigationManager.ImmediateNavigateControl(Direction: TNavigationDirection): TBoolean;
var
FocusedControl: TControl;
NextControl: TControl;
NavigationDimension: TNavigationDimension;
begin
Result := False;
if Direction in [TNavigationDirection.Up, TNavigationDirection.Down, TNavigationDirection.Left, TNavigationDirection.Right] then
begin
NavigationDimension := NavigationDirectionToDimension(Direction);
FocusedControl := FocusManager.FocusedControl;
if (FocusedControl <> nil) and (NavigationDimension <> TNavigationDimension.None) and not FocusedControl.HandlesNavigationDimension(NavigationDimension) then
begin
NextControl := NextNavigationControl(FocusedControl, Direction);
Result := (NextControl <> nil) and not NextControl.HandlesNavigationDimension(NavigationDimension);
if Result then
NextControl.Enter()
else if (History.Count > 0) and (History.Peek().PreviousControl = FocusedControl) then
History.Pop();
end;
end;
end;
function TControlNavigationManager.IsInverseNavigation(ControlNavigationInfo: TControlNavigationInfo; Direction: TNavigationDirection): TBoolean;
begin
Result :=
(InverseNavigationDirection(ControlNavigationInfo.Direction) = Direction) and
ControlNavigationInfo.PreviousControl.IsVisible;
end;
procedure TControlNavigationManager.LayoutControl(NavigationAction: TControlNavigationAction);
var
Control: TControl;
SplitPanel: TSplitPanel;
PanelIndex: TInteger32;
begin
Control := Current;
if Control.ParentControl is TSplitPanel then
begin
SplitPanel := Control.ParentControl as TSplitPanel;
PanelIndex := SplitPanel.PanelIndexOf(Control);
case NavigationAction of
cnaSplitHorizontal:
Control := SplitPanel.Split(PanelIndex, THorizontalSplitPanel);
cnaSplitVertical:
Control := SplitPanel.Split(PanelIndex, TVerticalSplitPanel);
cnaTab:
Control := SplitPanel.ToggleTabPanel(PanelIndex);
cnaToggleCaption:
Control := SplitPanel.ToggleCaption(PanelIndex);
else
raise EException.Create('Unknown control navigation action');
end;
Current := Control;
end;
end;
function TControlNavigationManager.KeyToNavigationAction(Key: TKey): TControlNavigationAction;
begin
case Key of
TKey.T: Result := cnaTab;
TKey.H: Result := cnaSplitHorizontal;
TKey.V: Result := cnaSplitVertical;
else
raise EException.Create('Unknown key for navigation action');
end;
end;
procedure TControlNavigationManager.NavigateControl(Direction: TNavigationDirection);
var
NextControl: TControl;
begin
if Current <> nil then
begin
NextControl := NextNavigationControl(Current, Direction);
if NextControl <> nil then
Current := NextControl;
end;
end;
function TControlNavigationManager.NextNavigationControl(CurrentControl: TControl; Direction: TNavigationDirection): TControl;
var
AncestorControl: TControl;
Side: TSide;
begin
if (History.Count > 0) and IsInverseNavigation(History.Peek(), Direction) then
Result := History.Pop().PreviousControl
else
begin
case Direction of
TNavigationDirection.Parent:
begin
Result := CurrentControl.ParentControl;
if Result <> nil then
Result := Result.GetChildOfDynamicContainer();
end;
TNavigationDirection.Child:
begin
// TODO: Implement
Result := nil;
end;
else
begin
Side := NavigationDirectionToSide(Direction);
AncestorControl := CurrentControl.AncestorControlWithControlsAtSide(Side);
if AncestorControl <> nil then
Result := CurrentControl.ControlAtSide(AncestorControl.ChildControls, Side)
else
Result := nil;
if Result <> nil then
Result := CurrentControl.LeafControlAtSide(Result, Side);
end;
end;
if Result <> nil then
History.Push(Direction, CurrentControl);
end;
end;
procedure TControlNavigationManager.Paint(Canvas: TCanvas);
begin
if IsActive then
ContainerControl.PaintAll(Canvas);
end;
procedure TControlNavigationManager.PrintScreen();
var
Canvas: TGdiCanvas;
Bitmap: TGdiBitmap;
Image: TRasterImage;
Size: TInteger32Size;
File_: TFile;
Stream: TOutputStream;
Writer: TPortableNetworkGraphicsWriter;
begin
Size := Current.Size;
Bitmap := TGdiBitmap.Create(Size);
Canvas := TGdiCanvas.Create();
Canvas.DeviceContext := Bitmap.DeviceContext;
IsActive := False;
Current.PaintAll(Canvas);
IsActive := True;
Canvas.Free();
Image := Bitmap.ConvertToRasterImage();
Image.AddReference();
File_ := TFile.Create('screenshot.' + DateTimeToTimeStampText(Now_Local()) + '.png');
Stream := File_.CreateRewriteStream();
try
Writer := TPortableNetworkGraphicsWriter.Create(Stream);
Writer.Write(Image);
Writer.Free();
finally
Stream.Free();
end;
File_.Free();
Bitmap.Free();
Image.ReleaseReference();
end;
procedure TControlNavigationManager.SetCurrent(const Value: TControl);
begin
if Value <> Current then
begin
if Current <> nil then
Current.Invalidate();
CurrentReference.Value := Value;
if Current <> nil then
begin
CurrentReference.Value := Current.RootComposition;
Current.MakeVisible();
UpdateOverlayBounds();
end;
end;
end;
procedure TControlNavigationManager.SetRootControl(const Value: TControl);
begin
if Value <> RootControl then
begin
FRootControl := Value;
ContainerControl.ParentControl := RootControl;
end;
end;
procedure TControlNavigationManager.SetUserLevel(Level: TUserLevel);
begin
if Current <> nil then
Current.GetControlFactory().UserLevel := Level;
end;
procedure TControlNavigationManager.Start();
begin
IsActive := True;
Current := FocusManager.FocusedControl.RootComposition;
if Current <> nil then
Current.Invalidate();
end;
procedure TControlNavigationManager.Stop(Successful: TBoolean);
begin
if IsActive then
begin
IsActive := False;
if Current <> nil then
begin
Current.Invalidate();
if Successful then
Current.Enter();
Current := nil;
end;
History.Clear();
OverlayControl.ActionsVisible := False;
end;
end;
procedure TControlNavigationManager.UpdateOverlayBounds();
var
Rectangle: TInteger32Rectangle;
begin
Rectangle := Current.GetVisibleRectangle();
if Current.HasAncestor(RootControl) then
Rectangle := Rectangle.Offset(Current.PositionRelativeTo(RootControl));
OverlayControl.Bounds := Rectangle;
end;
{ TControlNavigationStack }
procedure TControlNavigationStack.Clear();
begin
SetLength(Elements, 0);
end;
function TControlNavigationStack.Count(): TInteger32;
begin
Result := Length(Elements);
end;
function TControlNavigationStack.Peek(): TControlNavigationInfo;
begin
Result := Elements[High(Elements)];
end;
function TControlNavigationStack.Pop(): TControlNavigationInfo;
begin
Result := Peek();
SetLength(Elements, Length(Elements) - 1);
end;
procedure TControlNavigationStack.Push(Direction: TNavigationDirection; PreviousControl: TControl);
var
ControlNavigationInfo: TControlNavigationInfo;
begin
ControlNavigationInfo.PreviousControl := PreviousControl;
ControlNavigationInfo.Direction := Direction;
SetLength(Elements, Length(Elements) + 1);
Elements[High(Elements)] := ControlNavigationInfo;
end;
end.
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