public PanData(PanState state, Vector2 delta, Vector2 value, Vector2 absolute, Transform target)
: this()
{
this.state = state;
this.delta = delta;
this.value = value;
this.absolute = absolute;
this.target = target;
}
private void StartPanningIfNecessary(MouseButtonEventArgs e)
{
if (DesignerView.IsMouseInViewport(e, this.scrollViewer))
{
this.draggingMouseButton = e.ChangedButton;
this.CurrentPanState = PanState.Panning;
this.scrollViewer.Focus();
this.panningStartPosition = Mouse.GetPosition(this.scrollViewer);
Mouse.Capture(this.scrollViewer);
e.Handled = true;
}
}
private void StopPanning()
{
// stop panning
if (this.InPanMode ||
(Keyboard.IsKeyDown(Key.Space) && this.CurrentPanState == PanState.Panning))
{
this.CurrentPanState = PanState.ReadyToPan;
}
else
{
this.CurrentPanState = PanState.Normal;
}
}
internal void OnScrollViewerKeyUp(object sender, KeyEventArgs e)
{
switch (this.CurrentPanState)
{
case PanState.ReadyToPan:
if (e.Key == Key.Space && !this.InPanMode)
{
this.CurrentPanState = PanState.Normal;
}
break;
default:
break;
}
}
internal void OnScrollViewerKeyDown(object sender, KeyEventArgs e)
{
switch (this.CurrentPanState)
{
// Don't change to ReadyToPan mode if the space is a
// repeated input, because repeated-key input may come
// from activity element on the scroll view.
case PanState.Normal:
if (e.Key == Key.Space &&
!e.IsRepeat &&
this.AllowSwitchToPanning())
{
this.CurrentPanState = PanState.ReadyToPan;
}
break;
default:
break;
}
}
private void StopPanning()
{
// stop panning
if (this.InPanMode
|| (Keyboard.IsKeyDown(Key.Space) && this.CurrentPanState == PanState.Panning))
{
this.CurrentPanState = PanState.ReadyToPan;
}
else
{
this.CurrentPanState = PanState.Normal;
}
}
private void StartPanningIfNecessary(MouseButtonEventArgs e)
{
if (DesignerView.IsMouseInViewport(e, this.scrollViewer))
{
this.draggingMouseButton = e.ChangedButton;
this.CurrentPanState = PanState.Panning;
this.scrollViewer.Focus();
this.panningStartPosition = Mouse.GetPosition(this.scrollViewer);
Mouse.Capture(this.scrollViewer);
e.Handled = true;
}
}
internal void OnScrollViewerKeyUp(object sender, KeyEventArgs e)
{
switch (this.CurrentPanState)
{
case PanState.ReadyToPan:
if (e.Key == Key.Space && !this.InPanMode)
{
this.CurrentPanState = PanState.Normal;
}
break;
default:
break;
}
}
internal void OnScrollViewerKeyDown(object sender, KeyEventArgs e)
{
switch (this.CurrentPanState)
{
// Don't change to ReadyToPan mode if the space is a
// repeated input, because repeated-key input may come
// from activity element on the scroll view.
case PanState.Normal:
if (e.Key == Key.Space
&& !e.IsRepeat
&& this.AllowSwitchToPanning())
{
this.CurrentPanState = PanState.ReadyToPan;
}
break;
default:
break;
}
}
protected override void OnMouseMove(MouseEventArgs args)
{
base.OnMouseMove(args);
if(panState != PanState.None) {
if(panState == PanState.Pending) {
panState = PanState.Active;
Cursor = Cursors.SizeAll;
}
Vector mousePosition = (Vector)args.Location;
Vector delta = lastMousePosition - mousePosition;
camera.Pan(delta.X, delta.Y);
Refresh();
}
lastMousePosition = (Vector)args.Location;
}
protected override void OnMouseDown(MouseEventArgs args)
{
base.OnMouseDown(args);
if(args.Button == MouseButtons.Middle)
panState = PanState.Pending;
}
protected override void OnMouseUp(MouseEventArgs args)
{
base.OnMouseUp(args);
if(args.Button == MouseButtons.Middle) {
if(panState == PanState.Pending) {
// The user pressed and released the middle mouse button without dragging;
// reset the zoom.
camera.Scale = 1;
}
panState = PanState.None;
Cursor = Cursors.Default;
}
}
