When a WPF window opens it must be ready to handle a mouse click event.
It must handle this event until the window is closed.
you can create a single function with the shared behavior in your window, then call that function from both your loaded handler and your button click handler.
like-
void MainWindow_Loaded(object sender, RoutedEventArgs e)
{
button1_Click(sender, new RoutedEventArgs());
}
Related
I'm using WPF to design a borderless, movable application window.
In order to manually perform the ability to drag and drop the window, I've added an OnMouseDown event to the <Window> element, that executes a corresponding C# function (this.DragMove()).
Additionally, I need an <Image> button to allow some operation (with the OnMouseUp event this time). Note that it has to be an Image tag, and not a Button.
Unfortunately, the Image event fired only when the right mouse button is clicked, probably because the left button is held to the window event. Am I right?
When someone clicks the Image button, I want only the Image event to be triggered. How can I do it?
Problem you're facing is most probably related to event routing. The idea is that if your handler doesn't mark event as a Handled it will be routed to the next listener unless reach end of chain or one of listeners/handlers will set it as Hadnled.
So if you have MouseDown event handler for both Window and Image you should keep in mind that routing will stop at a point when you will set e.Handled = true;:
private void Window_OnMouseDown(object sender, KeyEventArgs e)
{
e.Handled = false; // will NOT break event chain;
}
You can always check a type of sender so it will make possible for you to differ Image and Window events:
private void Image_OnMouseDown(object sender, KeyEventArgs e)
{
if (sender is Image)
{
// Handle Image.MouseDown
e.Handled = true; // we don't need to push event further;
}
}
Its because of WPF bubbling and tunnelling events. so what u can do is whenever u handle event on button use bubbling for that means you can use previewevents for that for both button and window and whenever you just want to handle event for button then after last line of code in button click just write down like this.
e.handled=true;
// here e is the event argument which u will get in your preview event.so now window dragging event will not work.
i would just suggest first clear the idea of bubbling(preview mouse event) and tunneling in wpf.
Difference between Bubbling and Tunneling events
and go through some of the example of bubbling and tunnelling. you will get better idea.
http://www.codeproject.com/Articles/464926/To-bubble-or-tunnel-basic-WPF-events
I want to cancel the Context Menu Opened Event of a TreeViewItem
private void ContextMenu_Opened(object sender, RoutedEventArgs e)
{
e.Handled = true;
}
i thought this should work but instead i got a tiny context menu that has no menu items but i would like to have nothing appearing.
Thanks
You should use the ContextMenuOpening event of the control that owns the context menu, which is fired right before the context menu opens. There you can change the context menu or suppress it. Your code for the event to suppress works if you use the Opening event, see this article for further infos.
I have a WPF window .I want when my mouse cursor is outside the Control area of window and I am clicking on it I want my window to disappear is there any mechanism of achieving it thorough WPF??
Take a look at the Mouse.Capture method. This lets you get mouse events even if the mouse is outside your control.
Be sure to release the mouse once you're done though calling Capture with null.
To release mouse capture, call Capture passing null as the element to capture.
In the constructor place this:
public MyControl()
{
//Other stuff like initialize component
Mouse.Capture(this);
MouseLeftButtonDown += OnMouseLeftButtonDown;
}
Then implement that method:
private void OnMouseLeftButtonDown(object sender, MouseButtonEventArgs e)
{
if(!this.IsMouseOver)
{
Close(); //your closing implementation here
Mouse.Capture(null);
}
}
I have an application that can moved by dragging the title bar with the typical pattern using DragMove:
private void Window_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)
{
DragMove();
}
It works fine, but only if I click in a spot, and then drag. If I click while dragging my mouse over the title bar it doesn't move.
Is there another event than MouseLeftButtonDown I need to hook to?
Try calling MyWindow.CaptureMouse() in the MouseLeftButtonDown event handler and then calling MyWindow.ReleaseMouseCapture() in the MouseLeftButtonUp event handler.
I creating a custonmized box class (inherits from ComboBox). I don't want the text box to react to right mouse clicks. I can get rid of the context menu by setting this to null in ApplyTemplate, but right mouse clicks move the cursor. I tried hooking up PreviewMouseRightButtonDown in ApplyTemplate and setting Handled to True, but the event still gets through which is strange as it seems to work for the left click.
The cursor actually moves when the mouse button is released, so you want mark the MouseRightButtonUp event as handled. You could override OnMouseRightButtonUp:
protected override void OnMouseRightButtonUp(MouseButtonEventArgs e)
{
base.OnMouseRightButtonUp(e);
e.Handled = true;
}
Or you could attach a class handler to the MouseRightButtonUp event to mark it as handled:
static MyComboBox()
{
EventManager.RegisterClassHandler(
typeof(MyComboBox),
MouseRightButtonUpEvent,
new MouseButtonEventHandler(MyComboBox_MouseRightButtonUp));
}
private static void MyComboBox_MouseRightButtonUp(
object sender, MouseButtonEventArgs e)
{
e.Handled = true;
}
That will also prevent the context menu from being created without you having to set it to null explicitly.