I am trying to drag and drop a file onto a control in my application. The problem is that when you hold the mouse button down (i.e. dragging from widows explorer), my app does not fire any of the form events. They all work fine if the mouse is not down. Is appears that I need to enable the 'AllowDrop' for the application (it is enabled on the form)
What am I missing?
I am developing in vb.net 2008 in windows 7 environment
AllowDrop needs to be enable for the control/object you intend to drop on.
You also need to update the DragDropEffects in either the Enter or DragOver event. This allows you to validate and provide feedback for supported or unsupported drop items.
Private Sub UserControl11_DragEnter(ByVal sender As Object, ByVal e As System.Windows.Forms.DragEventArgs) Handles UserControl11.DragEnter
e.Effect = DragDropEffects.All
End Sub
Related
I record the mouse events on windows by using robotgo package. Package provides to get bitmap of clicked area but the latency of having bitmap is super sensitive situation here.
For example:
If I click any checkbox which is unchecked on the screen, provided bitmap must contains the state of unchecked but it provides me checked state and cannot simulate it with robotgo or cannot trigger click by using bitmap.
Solution to this scenario is that I need to prevent windows mouse click event until bitmap provided by the package (or adding some delay for click event) then trigger the click event on windows.
I made some research online but couldn't find a proper solution. How prevent click event on Windows in Go? Is it possible or is there any other way to make it happen?
A low-level mouse hook can eat mouse events. SendInput can generate mouse input events.
You would have to set a flag somewhere so you don't eat your own fake input events.
Keep in mind that SendInput is not perfect (can be detected by other hooks) and playing with the input system like this is usually not the best solution. Adding 500ms (or some other delay) to every mouse click is going to be very annoying for your users.
It is better to use UI Automation to get information about UI element states in other applications...
I have some old VB 6.0 code that I need to get running on Windows 10. We are not allowed to use Compatibility mode due to security and client refusal issues.
The only problem I am having is that whenever a button is clicked on the interface the menu items (across the top) become unresponsive. If you mouse over them the shading changes but clicking does not drop down the menu. Additionally, if I generate a message box pop up and click OK the menus come back to life.
I've tried setting focus to the main form in different situations, tried refreshing the parent and child forms. Also added a brand new button with no code behind it - not even an empty click event handler - and that button when clicked causes the same issue.
I should also add that the main form is an MDI form with three child forms. The buttons of course reside on the child forms.
I'm not sure how to proceed with this at this point. I certainly can't have a message box pop up after every button is clicked. Has anyone seen this before or have any ideas as to what causes it?
My MFC application has multiple top level (parented to the desktop) windows, any one of which can host an external application which can launch a modal dialog. Is there a way for one the other top level windows to get a notification when any of the others becomes modal?
My specific problem is that one of the my windows is hosting an embedded PDF viewer and when the user clicks print, only the window hosting the viewer is locked, not the others.
When a modal dialog is shown EnableWindow(FALSE) is called for the parent. It is deactivated now and will not accept any mouse input. Also it will not receive the keyboard focus.
When EnableWindow(FALSE) is called WM_ENABLE with wParam==FALSE is sent to the window.
When your parent receives this message you can call EnableWindow(FALSE) for all your other windows too. Recursion might be a problem here, but you can use a private window message or flags to prevent this.
Before the modal dialog closes EnableWndow(TRUE) is called again and WM_ENABLE with wParam==TRUE is sent again.
I have an air application. Clicking the application menu item opens a native window. Just like in other applications, I want that while the native window is open, access to other preferences in the application (like close application etc) should be disabled.
How can I do this?
I don't know of any easy way of doing this. The best I can think of is to listen for the DEACTIVATE event, prevent it, and then manually reactivate the window. Some code:
var args:NativeWindowInitOptions = new NativeWindowInitOptions();
var subWindow:NativeWindow = new NativeWindow(args);
subWindow.activate();
subWindow.addEventListener(Event.DEACTIVATE, onDeactivate);
private function onDeactivate(event:Event):void
{
event.preventDefault();
NativeWindow(event.target).activate();
}
This will ensure that this subWindow always retains focus until it is closed.
There are two differences that I can see between this method and typical application behavior for this type of subwindow.
1) The parent window can be dragged around (for some reason this does not dispatch a DEACTIVATE event)
2) Usually the subwindow should kind of "flicker" and plays an alert sound to indicate that it must be dealt with before further actions can be made (this is the the behavior for other applications on Windows 7 at least; I am not sure about other OS's).
For the dragging problem you should be able to have the parent window listen for the MOVING event and preventDefault() whenever the subwindow is active.
I don't see any good way of replication the behavior of 2. You can have the subwindow notifyUser(NotificationType.INFORMATIONAL) in the DEACTIVATE event but it's not the same thing that other applications do.
I have a VB6 ActiveX exe that is launched from a third-party CRM App. On launch, the main form opens but it starts to flash and then loses focus. If you move the form, you'll see a server busy screen with the Switch To, Retry button.
I've tried using SetFocus and the SetFocusAPI in the OnActivate event of the form, but that doesn't work. Are there any suggestions on how I can have this form have focus when launched from the other app?
Additional Info:
The OnLoad event calls the SetWindowPos API in order to center the app over the calling app and sets HWND_TOPMOST.
Additional Info:
The Active Window is the correct window(but it's clearly not in focus)
The foreground window is the calling application. SetForegroundWindow switches the foreground window, but immediately returns back to the calling app. It's not until I click on the form that the form is in the foreground. I'm attempting all of this within a loop in the module that calls the form (and not in the calling app).
The CRM application has to call AllowSetForegroundWindow to "authorize" the ActiveX ProcessID to "steal" the focus from the current process.
Have you tried setting the tab order on the form? Your user control should have a tab order of 0 so it gets the focus.
Also, where does the focus go after it is launched?