Obviously you dont have a mouse over effect on a touchscreen, but I would like some effect, maybe onclick? Does anybody have any suggestions?
On the touchscreen I'm working with right now, the mouse over is a persistent effect of clicks. In other words, it's as if after clicking an item with an actual mouse and releasing the button, one never moved the mouse pointer afterwards.
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I have an NSView subclass in which I need to detect left and right mouse down events. mouseDown: is working just fine, but rightMouseDown: doesn't fire until the mouse button has been released, at which point both the down and up methods are called in succession. How can I make the right mouse down event trigger its corresponding method immediately?
The problem was that I have a NSPanGestureRecognizer added to the NSView with its buttonMask set to 0x2 (right mouse button). If I remove or disable this gesture recogniser, it allows rightMouseDown: to be called when the right button is pressed down. I'm still trying to figure out why, but at least now I have a starting point.
I'm trying to implement system-wide drag operation with middle mouse button. It should override middle mouse drag behavior in other programs. Currently, I am handling global mouse events with system-wide hooks.
Problem is - many programs still receive and handle same events like I did not intercept them.
Here's what I tried:
not call the next hook for mouse down event: I never receive mouse up, so I don't know where and when to stop dragging
not call the next hook for mouse move: cursor slows down tremendously
not call the next hook for mouse up: most windows in the system stop reacting to mouse events completely after my drag is finished
always call the next hook in the chain: if the control under mouse has scroll in it, most of the time it will be scrolling while my drag is in progress. Also UWP apps continue receiving mouse events during my drag, so if a link in MS Edge happens to be under cursor when it started, and mouse does not leave Edge boundary, Edge receives click event, and new tab is opened
What I need is: when user holds middle mouse and starts dragging, my drag handler should be called, and no other handlers, like file drag, scroll, etc should happen.
I ended up with somewhat hacky solution:
do not call the next hook for mouse down for middle button
record where it was pressed
when handling mouse up, if user did not drag - replay the whole mouse up + mouse down using SendInput from a separate thread (to avoid deadlock due to reentrancy)
When you push down the left mouse button mouse down event fires. If you then move the mouse over a label (while holding the mouse button down) mouse over event does not fire.
Is there any way to enable this events or fire them manualy or simulate them?
What you are actually doing is two separate events, one is a mouse down event as you have described and the other is a mouse drag.
If you want to simulate them, that you might have to consider using a mouse click to track the user's (x,y) location. Subsequently, if you want to "simulate" it you could do some computation and decide for yourself if it is indeed a mouse click or mouse drag event that has occurred.
Hope it helps :) Cheers!
In almost any Windows application, I notice that holding the mouse button down in a non-client area causes the painting to stop. Why is this required?
For example, I have a Managed Direct 3D application which displays a spinning cube. If I place the pointer over the title bar and hold the mouse button down, the cube ceases to spin even though I have not coded any such condition into my loop.
Why is painting halted? What are the benefits? Most importantly, how can I work around this?
When you click on the title bar, there's a brief pause while the window manager tries to determine whether or not you're clicking or beginning a drag (moving the window). If you're still holding down the button, then it's a drag: the window manager sets up its own message loop and pumps messages until you release the mouse. Your window should still be able to process messages, because they'll still be dispatched, but if your animation depends on a custom message loop then you'll be stuck 'till the modal drag loop ends.
Work around it by triggering your animation in response to messages: a timer seems like a good choice to me.
Usually, when a user holds the mouse pressed over a button, moves the mouse away from the window, and then releases it, the button can tell that the mouse has been released even though the release has actually occured outside the window.
When I inspect mouse clicks in my window, how can I imitate the same behavior?
When a mouse button being pushed down over the window I get the WM_XBUTTONDOWN message, but Windows don't treat it as if anything is logically being "clicked", so after the mouse leaves the window, no further messages will arrive at the window, which results in a "lost" WM_XBUTTONUP message.
When you receive the button down, you capture the mouse. That means that all the mouse events until releasing the capture will be reported to the window that captured the mouse.
See the documentation here. You also have a link to an example from that page.
Use the DragDetect() function.
https://learn.microsoft.com/en-us/windows/win32/api/winuser/nf-winuser-dragdetect?redirectedfrom=MSDN