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Gestures 413 rev2 #1803

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2da61f1
first pass - re-add previous gesture work
derbyw Oct 16, 2020
229ead3
added Drag gesture and support in the test app
derbyw Oct 16, 2020
83cb956
gesture awareness for winforms platform
derbyw Oct 16, 2020
25ab85f
verification of gesture events on GTK
derbyw Oct 22, 2020
5f9c813
removed unused variable
derbyw Jul 7, 2021
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327 changes: 327 additions & 0 deletions src/Eto.Gtk/Forms/GtkControl.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -7,6 +7,7 @@
using System.Linq;
using System.Collections.Generic;
using System.IO;
using System.Net;
using System.Runtime.Serialization.Formatters.Binary;

namespace Eto.GtkSharp.Forms
Expand Down Expand Up @@ -68,6 +69,7 @@ static class GtkControl
public static readonly object Cursor_Key = new object();
public static readonly object AllowDrop_Key = new object();
public static uint? DefaultBorderWidth;

}

public abstract class GtkControl<TControl, TWidget, TCallback> : WidgetHandler<TControl, TWidget, TCallback>, Control.IHandler, IGtkControl
Expand All @@ -79,6 +81,18 @@ public abstract class GtkControl<TControl, TWidget, TCallback> : WidgetHandler<T
bool mouseDownHandled;
#if GTK2
Color? cachedBackgroundColor;
#else

// In GTK the gesture types are handled by external classes for each type of gesture
private static Gtk.GestureSwipe swipe;
private static Gtk.GestureRotate rotate;
private static Gtk.GestureZoom zoom;
private static Gtk.GesturePan panv;
private static Gtk.GesturePan panh;
//private static Gtk.GestureLongPress longpress;
private static Gtk.GestureMultiPress longpress;
private static Gtk.GestureDrag drag;

#endif
Color? backgroundColor;

Expand Down Expand Up @@ -428,6 +442,61 @@ public override void AttachEvent(string id)
EventControl.AddEvents((int)Gdk.EventMask.ScrollMask);
EventControl.ScrollEvent += Connector.HandleScrollEvent;
break;
#if GTK3
case Eto.Forms.Control.SwipeGestureEvent:
EventControl.AddEvents((int)Gdk.EventMask.TouchpadGestureMask);
swipe = new Gtk.GestureSwipe(Control);
swipe.PropagationPhase = Gtk.PropagationPhase.Bubble;
swipe.Swipe += Connector.HandleSwipeGestureEvent;
break;
case Eto.Forms.Control.RotateGestureEvent:
EventControl.AddEvents((int)Gdk.EventMask.TouchpadGestureMask);
rotate = new Gtk.GestureRotate(Control);
rotate.PropagationPhase = Gtk.PropagationPhase.Bubble;
rotate.AngleChanged += Connector.HandleRotateGestureEvent;
break;
case Eto.Forms.Control.PanHGestureEvent:
EventControl.AddEvents((int)Gdk.EventMask.TouchpadGestureMask);
panh = new Gtk.GesturePan(Control,Gtk.Orientation.Horizontal);
panh.PropagationPhase = Gtk.PropagationPhase.Bubble;
panh.Pan += Connector.HandlePanHGestureEvent;
//pan.TouchOnly = true;
break;
case Eto.Forms.Control.PanVGestureEvent:
EventControl.AddEvents((int)Gdk.EventMask.TouchpadGestureMask);
panv = new Gtk.GesturePan(Control,Gtk.Orientation.Vertical);
panv.PropagationPhase = Gtk.PropagationPhase.Bubble;
//pan.TouchOnly = true;
panv.Pan += Connector.HandlePanVGestureEvent;
break;

case Eto.Forms.Control.LongPressGestureEvent:
EventControl.AddEvents((int)Gdk.EventMask.TouchpadGestureMask);
longpress = new Gtk.GestureMultiPress(Control);

longpress.PropagationPhase = Gtk.PropagationPhase.Bubble;
longpress.Begin += Connector.HandleLongPressBeginGestureEvent;
longpress.Pressed += Connector.HandleLongPressGestureEvent;
longpress.End += Connector.HandleLongPressDoneGestureEvent;
longpress.Cancel += Connector.HandleLongPressCancelGestureEvent;
longpress.TouchOnly = true;
break;
case Eto.Forms.Control.ZoomGestureEvent:
EventControl.AddEvents((int)Gdk.EventMask.TouchpadGestureMask);
zoom = new Gtk.GestureZoom(Control);
zoom.PropagationPhase = Gtk.PropagationPhase.Bubble;
zoom.ScaleChanged += Connector.HandleZoomGestureEvent;
break;
case Eto.Forms.Control.DragGestureEvent:
EventControl.AddEvents((int)Gdk.EventMask.TouchpadGestureMask);
drag = new Gtk.GestureDrag(Control);
drag.PropagationPhase = Gtk.PropagationPhase.Bubble;
drag.DragBegin += Connector.HandleDragStartGestureEvent;
drag.Update += Connector.HandleDragGestureEvent;
drag.End += Connector.HandleDragDoneGestureEvent;
break;

#endif
case Eto.Forms.Control.GotFocusEvent:
EventControl.AddEvents((int)Gdk.EventMask.FocusChangeMask);
EventControl.FocusInEvent += Connector.FocusInEvent;
Expand Down Expand Up @@ -466,6 +535,7 @@ public override void AttachEvent(string id)
}
}


protected new GtkControlConnector Connector { get { return (GtkControlConnector)base.Connector; } }

protected override WeakConnector CreateConnector()
Expand Down Expand Up @@ -662,7 +732,264 @@ public void HandleKeyReleaseEvent(object o, Gtk.KeyReleaseEventArgs args)
args.RetVal = e.Handled;
}
}

#if GTK3
[GLib.ConnectBefore]
public void HandleSwipeGestureEvent(object o, Gtk.SwipeArgs args)
{
var handler = Handler;
if (handler == null)
return;

var e = new SwipeGestureEventArgs(args.VelocityX, args.VelocityY);
if (e != null)
{
handler.Callback.OnSwipe(Handler.Widget, e);
args.RetVal = e.Handled;
}
}

[GLib.ConnectBefore]
public void HandleRotateGestureEvent(object o, Gtk.AngleChangedArgs args)
{
var handler = Handler;
if (handler == null)
return;

// could be rotate.AngleDelta if event args is not right
var e = new RotateGestureEventArgs(rotate.AngleDelta);
//var e = new RotateGestureEventArgs(args.Angle);
if (e != null)
{
handler.Callback.OnRotate(Handler.Widget, e);
args.RetVal = e.Handled;
}
}

[GLib.ConnectBefore]
public void HandlePanHGestureEvent(object o, Gtk.PanArgs args)
{
var handler = Handler;
if (handler == null)
return;



PanDirection Dir = PanDirection.Left;

switch (args.Direction)
{
case Gtk.PanDirection.Up:
Dir = PanDirection.Up;
break;
case Gtk.PanDirection.Down:
Dir = PanDirection.Down;
break;
case Gtk.PanDirection.Left:
Dir = PanDirection.Left;
break;
case Gtk.PanDirection.Right:
Dir = PanDirection.Right;

break;
default:
break;
}
var e = new PanGestureEventArgs(true, 1, Dir, args.Offset);
if (e != null)
{
handler.Callback.OnPanH(Handler.Widget, e);
args.RetVal = e.Handled;
}
}


[GLib.ConnectBefore]
public void HandlePanVGestureEvent(object o, Gtk.PanArgs args)
{
var handler = Handler;
if (handler == null)
return;

bool vpan = false;

PanDirection Dir = PanDirection.Left;

switch (args.Direction) {
case Gtk.PanDirection.Up:
Dir = PanDirection.Up;
vpan = true;
break;
case Gtk.PanDirection.Down:
Dir = PanDirection.Down;
vpan = true;
break;
case Gtk.PanDirection.Left:
Dir = PanDirection.Left;
vpan = false;
break;
case Gtk.PanDirection.Right:
Dir = PanDirection.Right;
vpan = false;
break;
default:
break;
}
// could be rotate.AngleDelta if event args is not right
var e = new PanGestureEventArgs(true, 1, Dir, args.Offset);
if (e != null)
{
handler.Callback.OnPanV(Handler.Widget, e);
args.RetVal = e.Handled;
}
}

[GLib.ConnectBefore]
public void HandleLongPressBeginGestureEvent(object o, Gtk.BeginArgs args)
{
var handler = Handler;
if (handler == null)
return;

double X, Y;
longpress.GetBoundingBoxCenter(out X, out Y);


var e = new LongPressGestureEventArgs(false, (int)longpress.NPoints, X, Y);
if (e != null)
{
handler.Callback.OnLongPress(Handler.Widget, e);
args.RetVal = e.Handled;
}
}


[GLib.ConnectBefore]
public void HandleLongPressGestureEvent(object o, Gtk.PressedArgs args)
{
var handler = Handler;
if (handler == null)
return;

//double X, Y;
//longpress.GetBoundingBoxCenter (out X, out Y);

//var e = new LongPressGestureEventArgs (true, (int)longpress.NPoints, X, Y);
var e = new LongPressGestureEventArgs(true, args.NPress, args.X, args.Y);
if (e != null)
{
handler.Callback.OnLongPress(Handler.Widget, e);
args.RetVal = e.Handled;
}
}

[GLib.ConnectBefore]
public void HandleLongPressDoneGestureEvent(object o, Gtk.EndArgs args)
{
var handler = Handler;
if (handler == null)
return;

var e = new LongPressGestureEventArgs(false, 0,0,0);
if (e != null)
{
handler.Callback.OnLongPress(Handler.Widget, e);
args.RetVal = e.Handled;
}
}


[GLib.ConnectBefore]
public void HandleLongPressCancelGestureEvent(object o, Gtk.CancelArgs args)
{
var handler = Handler;
if (handler == null)
return;

var e = new LongPressGestureEventArgs(false, 0, 0, 0);
if (e != null)
{
handler.Callback.OnLongPress(Handler.Widget, e);
args.RetVal = e.Handled;
}
}

[GLib.ConnectBefore]
public void HandleZoomGestureEvent(object o, Gtk.ScaleChangedArgs args)
{
var handler = Handler;
if (handler == null)
return;

// could be rotate.AngleDelta if event args is not right
var e = new ZoomGestureEventArgs(args.Scale);
if (e != null)
{
handler.Callback.OnZoomExpand(Handler.Widget, e);
args.RetVal = e.Handled;
}
}


[GLib.ConnectBefore]
public void HandleDragStartGestureEvent(object o, Gtk.DragBeginArgs args)
{
var handler = Handler;
if (handler == null)
return;

// capture the
drag.GetStartPoint(out double X, out double Y);

var e = new DragGestureEventArgs (true, (int)drag.NPoints, X ,Y, 0, 0);
if (e != null)
{
handler.Callback.OnDragGesture(Handler.Widget, e);
args.RetVal = e.Handled;
}
}


[GLib.ConnectBefore]
public void HandleDragGestureEvent(object o, Gtk.UpdateArgs args)
{
var handler = Handler;
if (handler == null)
return;

drag.GetStartPoint(out double Xstart, out double Ystart);
drag.GetBoundingBoxCenter (out double X, out double Y);

// usually we will want a relative delta here
double deltaX = X - Xstart;
double deltaY = Y - Ystart;


var e = new DragGestureEventArgs (true, (int)drag.NPoints, Xstart, Ystart, deltaX, deltaY);
if (e != null)
{
handler.Callback.OnDragGesture(Handler.Widget, e);
args.RetVal = e.Handled;
}
}

[GLib.ConnectBefore]
public void HandleDragDoneGestureEvent(object o, Gtk.EndArgs args)
{
var handler = Handler;
if (handler == null)
return;

var e = new DragGestureEventArgs(false, 0,0,0, 0, 0);
if (e != null)
{
handler.Callback.OnDragGesture(Handler.Widget, e);
args.RetVal = e.Handled;
}
}

#endif

public virtual void FocusInEvent(object o, Gtk.FocusInEventArgs args)
{
var handler = Handler;
Expand Down
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