Develop Reference

Simulating a right click in wpf

I would like to simulate/route right click on a WPF "control".
To make a long story short. I have an Adorner which should react to left click (so is hit test visible must be true) but at the same time I would like it to be "transparent" for the right clicks. (In another words i would like for a control under it to receive this click - btw right click makes Adorner disappear).
I tried to raise MouseRightButtonUp event on control directly under mouse (after Adorner disappears but it doesn't seem to work). I would like to avoid calling system functions (like mouse_event through P/Invoke). Can it be even done in wpf?

As far as I remember, I had troubles with routing events and changing Adorners IsHitTestVisible property. The main problem was, if I recall it correctly, that adorner and controls are on different branches of visual tree, so routed events spawned on the adorner won't make it to your controls.
I can't say much without you providing the code, but the simplest thing that should work would be to find a control under your mouse position and do
private void myAdorner_MouseRightButtonDown(object sender, MouseButtonEventArgs e)
{
MouseButtonEventArgs revent = new MouseButtonEventArgs(e.MouseDevice, e.Timestamp, MouseButton.Right);
revent.RoutedEvent = e.RoutedEvent;
//find you control
control.RaiseEvent(revent);
}

Is there any drag - move method in Qt5?

I remember that in C# there is a method called DragMove() that allows to drag a window by clicking on the selected area.
Example (from this answer):
private void Window_MouseDown(object sender, MouseButtonEventArgs e)
{
if (e.ChangedButton == MouseButton.Left)
this.DragMove();
}
Is there any function like this in Qt world?
I know that a solution would be to listen for mousePressEvent and mouseMoveEvent but I just want to know if there is native method that would allow to drag the winodw on the screen just calling it, like in C# this.DragMove().
Also, it needs to be cross-platform...

No, there is no function like what you refer to in Qt. Listening for mouse events is simple, and would be considered idiomatic in Qt.
If you want the widget to be draggable by pressing anywhere between controls, just implement those events in the base event. Any area not covered by controls will be "draggable".

Prevent mouse events during wpf Window.OnActivate

Is it possible to prevent mouse events when a window is activated?
For example, I have a C# window and I change the focus to something else such as a browser. When I reactivate the c# window by clicking on it, I don't want any mouse events to be executed. The first click on the window should just activate it. Mouse Events are only fired if the window is already activated.

An event will be fired then a user clicks on your wpf controll but why don't you just handle the event?
Subscribe to the event and prevent it to bubble up the visual tree:
private void Panel_KeyDown(object sender, KeyEventArgs e)
{
e.Handled = true;
}
Have a look at this link it describes the event bubble and tunneling in WPF.

Handle event in splitter area of splitcontainer control

Is there any trivial way to handle click event on the splitter area of the WinFroms splitcontainer control? (symbolized by blue in my picture) E.g. I'd like to collapse panel1 by double clicking this area.
Or another possibility to put some nice button in this area and by clicking it I can collapse panels.
I don't wanna great hack to make a soulution, it would be nice to have a trivial one.
Thx
(.net 4/c#/VS2010)

You should be able to use the SplitContainer.DoubleClick event for this purpose..
splitContainer1.DoubleClick += splitContainer1_DoubleClick;
and
private void splitContainer1_DoubleClick(object sender, EventArgs e)
{
splitContainer1.Panel1Collapsed = true;
}
If you want the location of the click, use MouseDoubleClick event which comes with MouseEventArgs for the event handler.

You mean besides the SplitContainer's Click event?

WPF create a list of controls that can be scrolled via the mouse but still remain functional

I have a list of controls that I am displaying via a WrapPanel and it horizontally oriented.
I have implemented a "Click and Drag" scrolling technique so that the user scrolls with the mouse via clicking and dragging.
Like so:
<Canvas x:Name="ParentCanvas" PreviewMouseDown="Canvas_MouseDown" MouseMove="Canvas_MouseMove">
<WrapPanel>
<WrapPanel.RenderTransform>
<TranslateTransform />
</WrapPanel.RenderTransform>
<!-- controls are all in here ... -->
</WrapPanel>
</Canvas>
Then in the code behind:
private Point _mousePosition;
private Point _lastMousePosition;
private void Canvas_MouseDown(object sender, MouseButtonEventArgs e)
{
_lastMousePosition = e.GetPosition(ParentCanvas);
e.Handled = true;
}
private void Canvas_MouseMove(object sender, MouseEventArgs e)
{
_mousePosition = e.GetPosition(ParentCanvas);
var delta = _mousePosition - _lastMousePosition;
if(e.LeftButton == MouseButtonState.Pressed && delta.X != 0)
{
var transform = ((TranslateTransform)_wrapPanel.RenderTransform).Clone();
transform.X += delta.X;
_wrapPanel.RenderTransform = transform;
_lastMousePosition = _mousePosition;
}
}
This all works fine
But what I want to do is make it so that when a users clicks to drag, the items within the WrapPanel dont respond (i.e. the user is only browsing), but when the user clicks (as in a full click) then they do respond to the click.
Just like how the iphone works, when you press and drag directly on an app, it does not open the app, but rather scrolls the screen, but when you tap the app, it starts...
I hope this makes sense.
Cheers,
Mark

I believe you'll need to capture the mouse. The problem is you'll be contending with the controls (such as Button) that will also be trying to capture the mouse.
In your MouseDown event (probably PreviewMouseDown actually) you can use e.MouseDevice.Capture(_wrapPanel, CaptureMode.Element). This should direct all mouse input to the _wrapPanel and not any subtree elements.
In your MouseUp event, you'll need to release the capture by calling e.Mousedevice.Capture(null). If no scrolling has taken place you'll want to send a "click" to the control that normally would have received the click which I'm not quite sure about. Perhaps you can use the Automation Peer classes to do this?
The trick is that certain controls will not work properly if you withhold mouse events from them. Consider a slider for example. How would the slider ever be usable inside a panel that works like this?

Another, and in my opinion better, solution is to:
Add a PreviewMouseDown handler in which you set Handled=true and record the parameters including the position and set a "maybeClick" flag (unless your "recursion" flag is set), and sets a timer.
Add a MouseMove handler that clears the "maybeClick" flag if the mouse moves more than an epsilon away from the position recorded for the PreviewMouseDown.
Add a PreviewMouseUp handler that checks the "maybeClick" flag - if true, it sets the "recursion" flag, does an InputManager.ProcessInput to re-raise the original PreviewMouseDown, and then clears the "recursion" flag.
In the timer, do the same thing as for PreviewMouseUp so the click will only be delayed a moment.
The net effect is to delay a PreviewMouseDown event until you have had time to check whether the mouse moved or not.
Some things to note about this solution:
Setting Handled=true on PreviewMouseDownEvent also stops the MouseDownEvent.
The recursive call is ignored in the PreviewMouseDown handler because the recursion flag is set