I need an event which handles clicks on main window of my program.
I used button-press-event but when i click on my window nothing happens.
I'm designing my GUI using Glade Interface Designer.
please explain for me when button-press-event will be called in gtk+ & is it the event i need or not?
Check you've got the button press event mask set for the window under the
Window Properties - Common tab in glade
'button-press-event' should give you mouse button presses. It may be that you need to use gtk_widget_add_device_events () to add button presses to the list of events that are received by the window but I think it should get them by default, can you post you code please?
Related
I'm working on a Winforms project that uses CefSharp as a Gui. For several reasons I would like to implement a custom context menu using the Winforms ContextMenu class; rendering the menu in Html or customizing the ChromiumWebBrowser's context menu (using CefSharp.IContextMenuHandler) are not an option.
The context menu it triggered by Javascript code that calls a method on a .net object I passed to RegisterAsyncJsObject; the default context menu is prevented using Javascript. I'm invoking the method call on the Gui thread, because the call over the "javascript bridge" to the registered object comes from a different thread.
My problem: when manually showing the Winforms context menu over the CefSharp.WinForms.ChromiumWebBrowser the context menu does not get the keyboard focus (e.g. selecting items with the arrow key doesn't work nor can I close the contextmenu using Esc); instead the keyboard focus remains with the ChromiumWebBrowser control. And, if I click on the ChromiumWebBrowser's control area the context menu doesn't close either. I can only close the context menu by selecting an item with the mouse or clicking on another control within the form (in which the ChromiumWebBrowser is contained) or somewhere completely else (e.g. desktop or another application).
If I trigger the context menu from elsewhere in my code - ultimately using the same method that calls myContextMenu.Show() - the context menu gets the keyboard focus as desired. But one problem still remains: it doesn't close when I click within the ChromiumWebBrowser control.
I haven't used IFocusHander, IContextMenuHandler, IKeyboardHandler - should I?
I'm using CEF 3.2454.1344.g2782fb8, Chromium 45.0.2454.101 and .net 4.5.1.
Unfortunately extracting demo code isn't reasonably possible.
Anyone any ideas?
EDIT1:
After reading the comments, I decided to describe the code flow more precisely:
When right clicking Javascript sends a message to the registered .net object, containing the mouse coordinates. The default context menu is prevented by setting preventDefault on the MouseEvent arguments of the ContextMenu event.
The registered .net object receives the messages and calls windowForm.Invoke(Sub() ... ), because the message is not received on the Main/Gui thread, but must be processed there for the context menu to appear correctly.
The contextmenu is created and assigned to the ContextMenuStrip property of the UserControl that contains the actual ChromiumWebBrowser control.
It is displayed using ContextMenuStrip.Show(location) method.
Issues:
The context menu has no keyboard-focus.
All mouse events appear to be "swallowed" by the ChromiumWebBrowser: clicking there does not close the context menu.
Opening the context menu identically except for using a different "trigger" works fine, except for the 2nd issue.
In the end the solution is simple; everything works as implemented and desired, if the following steps are added:
Before showing the context menu disable the UserControl with the ChromiumWebBrowser and set the focus to the owning form; something like this:
Private Sub showContextMenu(position As Point)
Me.ctrlCefBrowser.Enabled = False
Me.Focus()
myContextMenu.Show(position)
End Sub
That takes the focus away from the ChromiumWebBrowser, giving the context menu a chance to respond to the keyboard inputs. And also, by disabling the control, the mouse events are not "swallowed" anymore so clicking on the browser area causes the context menu to go away again.
Then, finally, add an event handler to the context menu to re-enable the browser control again:
Private Sub myContextMenu_Closed(sender As Object, e As ToolStripDropDownClosedEventArgs) Handles myContextMenu.Closed
Me.ctrlCefBrowser.Enabled = True
Me.ctrlCefBrowser.Focus()
End Sub
That did the trick for me, now I have a fully customizable Gdi context menu for my webbrowser control :o)
Note:
A similar problem arises when using other menus as well, e.g. in a main menu or tool bar: clicking on the ChromiumWebBrowser control will not close the menu (because the mouse event is also "swallowed"). The same solution can be applied: when opening a drop down menu deactivate (Enabled = False) the web browser control. And when it closes, reactivate it. For my menus I used a derived class (Inherits ToolStripMenuItem) that adds listeners to the according events. That takes care of the problem in a global and simple way.
EDIT:
The proposed solution above left the problem that the click on the disabled browser control closed the menu as intended, but got lost, i.e. the browser couldn't process it. My current workaround now is:
Do not disable the browser control.
Using the openening events of menu items and context menus, keep track of which menu is currently open.
When the browser receives the focus (obtainable by intercepting WndProc messages) close the opened menu.
Implementing the actual solution caused some headaches in the details, but maybe that helps someone along anyhow...
I am creating an windows form application and I want to know how to check when the maximize button is clicked.
Can someone please help me?
The re-size even handler is not detecting when the form is maximized or normal.
And I don't see any event handler for the maximize button on the control box.
Or is there any script in windows form that constantly run over and over.
You need to hook up into ClientSizeChanged event. In this event you can monitor WindowState.
To show a messagebox when window is maximized, add following code into forms ClientSizeChanged event:
If(WindowState == FormWindowState.Maximized)
{
MessageBox.Show("Maximized")
}
New Thought, Maybe I am looking at this totally incorrectly. So Here is exactly what I am trying to do in case there is another option I am not aware of.
I have a WPF app, the main window shows a smaller dialog window using ShowDialog(), when a user clicks on the parent window that showed the dialog, I need to make the dialog window, flash, shake or blink.
AresAvatar posted a link that looks like it might be able to use, but is there another option I am not aware of?
My original Question.
Mouse click event when Modal window's parent is clicked in WPF app?
I have a wpf app that shows a modal window using ShowDialog().
I would like to fire an event when the user tries to click the parent window that is now disabled.
Is it possible on the parent to receive a click event when it has shown a modal window?
When I attempted this using an interaction trigger, the events never fired on parent window.
Otherwise, what suggestions / options are there.
Thanks
No WPF events are sent under these conditions. The only Windows message I can see that gets sent is WM_WINDOWPOSCHANGING. You could check for that message, and check if the window was disabled when it occurred. Here's a good article on checking WM_WINDOWPOSCHANGING.
Edit: that link seems to be dead. Here's an example on StackOverflow of checking window messages.
I know this is an old question but I'll post my solution in case any one needs it.
Set the dialog.owner prior to calling ShowDialog().
var dialog = new DialogWindow();
dialog.owner = MainWindow;
dialog.ShowDialog();
The result is that clicking on the main window, brings the dialog window to the front and makes the dialog window flash.
Is there a possibility to detect if a Popup is activated or deactivated? Such as the Window-events Window.Activated and Window.Deactivated.
I want to detect if the user has clicked outside of the popup (I can not use the Popup.StaysOpen=false option).
Update
I have forgotten to remark, that I dont want to add any handler or code to a parent-control of the popup.
Capture mouse clicks for your main application window (MousePreview type event) and for popup - when user clicks into popup, main window event doesn't fire and vice versa.
Sounds like you could just use the Popup.Opened and Popup.Closed events.
I'm trying to show a context menu when I left-click a NotifyIcon. Just calling NotifyIcon.ContextMenuStrip.Show() doesn't work very well. A solution has been posted here before that calls a secret method using Reflection:
Dim mi As System.Reflection.MethodInfo = GetType(NotifyIcon).GetMethod("ShowContextMenu", Reflection.BindingFlags.Instance Or Reflection.BindingFlags.NonPublic)
mi.Invoke(Icon, Nothing)
This works great, except that I also need to control where the menu is shown. I want to wait for the SystemInformation.DoubleClickTime to elapse between receiving the NotifyIcon.MouseUp event and displaying the menu, so that I can handle single-clicks and double-clicks separately. But invoking the ShowContextMenu method displays the menu at the current mouse position when ShowContextMenu is called, not when the icon was actually clicked. Which means that if the mouse moved during the DoubleClickTime, the menu will be displayed in a different part of the screen. So if I can control where the menu is shown, I can just save the mouse coordinates when I receive the MouseUp event, and then I can ensure that the menu is displayed near the icon. Is there a way to do this?
Thanks in advance.
Well, I just discovered that there are existing programs that exhibit this same behavior. I just went through all the icons in my system tray and about half of them do it. If you left-click the icon and then move the mouse during the delay before the menu appears, the menu will appear at the last mouse location, wherever that is on the screen. Snagit is one application that does this. Outlook is the only program in my tray that always shows the menu where I clicked the icon. But Snagit looks like it's using a .NET ContextMenuStrip, while Outlook is probably using a native menu.
So either this is standard behavior, or it's a problem that no one else has been able to solve either. And as a user, I've never noticed this behavior until yesterday when I was testing my own application. So I guess it's not that big of a deal and I won't worry about it.