drag

I am developing an analog clock picker control. The user is able to click on the minute or hour hand and drag to turn the needle to select the specific time. I was wondering how to detect such a click and drag event. I tried using MouseLeftButtonDown + MouseMove but I cannot get it to work as MouseMove is always trigger when the mousemove happen despite me using a flag. Is there any easier way? public bool dragAction = false; private void minuteHand_MouseLeftButtonDown(object sender, MouseButtonEventArgs e) { dragAction = true; minuteHand_MouseMove(this.minuteHand, e); } private void

I have series of interactive sliders that change calculated values. The calculations run on every tiny move of a dragged handle (via mousedown or touch drag event). I need to update a database with the values but would prefer only to grab the values after the user "drops" the handle. How can I determine if a finger or mouse is down, in order to skip the AJAX call? function handleIsBeingDragged() { // calculations based on all the input values here // pseudo-code to check for mouseup event if (mouseUp) { // save only if mouse is now up - to avoid hundreds of updates per drag event $.ajax(); } }

I am working on a GTK+ application that uses goocanvas to display a graph on screen. I am having problems coming up with a good way to implement drag scrolling. Currently the app saves the coordinates where the user clicked and then in a "motion-notify" signal callback, does goo_canvas_scroll_to() to the new position. The problem is that drawing is somewhat slow, and with each pixel moved by the mouse, I get the callback invoked once. This makes the drawing lag behind when dragging the graph around. Is there a good way to do drag scrolling, so it'd appear more smooth and I could skip some of