help! i want a loop to continue while my mouse is over a picture box but stop when it leaves

deryk_2784

hi everyone. right now, i have a map graphic displayed on my program's main screen. around it are four buttons. what i basically want to happen is, since the map is too big to show all at once, i want to use the four buttons to make the map scroll left or right. let's call the top button "UpMap". i currently have an action set for its mouseenter that goes something like: //UpMove, yMap, and xMap are all global variables UpMove = true; //to tell the program to keep the image moving upward while(UpMove) { yMap -= 1; //to set the image to a point 1 pixel higher than its previous location this.map_graphic.Location = new System.Drawing.Point(xMap, yMap); } for the mouseleave, i have something like: UpMove = false; i take it once the mouse enters the picture box area, UpMove is set to true and the loop starts and continues. supposedly, once the mouse leaves the area, it should set UpMove to false, thus stopping the loop. but what happens is that the loop continues infinitely, and the image moves up continuously and i can't even close the application window. any ways to fix this or any other suggestions on how to do it? :) thanks!

3 Replies

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Mykonine22y ago
This was a trick I used for your type of animation: Use four System.Windows.Forms.Timer controls for each direction. Then attach the code to move the map to each timer's Tick event. When the mouse enters the picture box, start the timer. When the mouse leaves, stop the timer. One for each direction of course. I often use that Timer to work around creating my own threads.
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p.jones22y ago
I'll stab a guess that your infinite loop is a part of the event handler for the mouseenter event so then you will never leave that event handler so as to handle the next event the miouseleave. So probably you will look at starting a thread in your first event handler that runs the loop so you can return and get proces sthe next event??
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Adam Erstelle22y ago
What you could try doing is creating a thread with the logic & processing of moving the map up. When the mouse leaves the area, you can terminate the thread.
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