I would like to start a slider action programmatically. So pressing on some text in a NSTextView that displays a slider also automatically starts the mousedown event on the slider so you can drag immediately instead of pressing twice. What approach should i take on this? Should i listen for global mouse events and then manually update the slider position, or can i somehow imitate the systems mouseDown / mouseMoved calls on the NSSlider?
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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)
I have an (big) NSImageView embedded in an (smaller) NSScrollView. I want to automatically scroll if the mouse goes near the edge of the window, how do I do this?
You could create an NSTrackingArea to be notified when the mouse enters a particular area of a view and then use one of NSResponder's scroll.. routines to scroll the view.
Cocoa has a built in method called NSView.autoscroll(with:) which will automatically scroll the enclosing scroll view when tracking mouse events and the cursor is outside of the scroll view's clip view.
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!
I have a little popup window used for selecting images sorted by groups, and I would like to add a selection box around whatever image is being hovered over. I am trying to this by overriding the mouseMoved event for the window but it seems that a window that has a border-less style mask receives no mouseMoved events even if you have set setAcceptsMouseMoved events to YES. Is there anyway to make a borderless window receive this events?
You need to allow the window to become the key window. By default, borderless windows cannot become key. Subclass NSWindow and override -canBecomeKeyWindow:
- (BOOL)canBecomeKeyWindow
{
return YES;
}
Aternatively, you can use an NSTrackingArea to do your mouse tracking, which may be easier/better anyway.