+/**
+ * Library functions for resizing widgets
+ *
+ */
+
+
+
+// event handler temporary storage variables for IE 4
+//
+var old_mousemove_handler;
+var old_mouseup_handler;
+
+
+
+// define variables used in vertical resize handlers
+//
+var element_being_vert_resized;
+var element_being_vert_resized_orig_opacity;
+var min_vert_resize_height;
+var max_vert_resize_height;
+var original_vert_click_pos;
+var original_vert_height;
+
+
+
+/**
+ * Begin a (vertical only) resize of some element
+ *
+ * Note that this event handler is only intended
+ * to be called for an event (usually mousedown)
+ * that is registered as a tag attribute (not with
+ * addEventListener() and ilk).
+ *
+ * @param evt The JavaScript event object
+ * @param resize_element The element being resized
+ * @param min_height The minimum allowable resize height
+ * @param max_height The maximum allowable resize height
+ * @param handle_element The handle element that was clicked
+ * upon to initiate the resize
+ *
+ */
+function startVertResizeDrag(evt, resize_element, min_height,
+ max_height, handle_element)
+{
+
+ // assign variables used in other handlers
+ //
+ element_being_vert_resized = resize_element;
+ min_vert_resize_height = min_height;
+ max_vert_resize_height = max_height;
+
+
+ // dim element to emphasize effect
+ //
+ element_being_vert_resized_orig_opacity = element_being_vert_resized.style.opacity;
+ element_being_vert_resized.style.opacity = 0.25;
+
+
+ // detemine original vertical click coordinates
+ //
+ original_vert_click_pos = evt.clientY;
+ original_vert_height = element_being_vert_resized.offsetHeight;
+
+
+ // add drag and finish drag listeners
+ //
+ if (document.addEventListener) // DOM Level 2 Event Model
+ {
+ document.addEventListener('mousemove', continueVertResizeDrag, true);
+ document.addEventListener('mouseup', finishVertResizeDrag, true);
+ }
+ else if (document.attachEvent) // IE 5+ Event Model
+ {
+ document.attachEvent("onmousemove", continueVertResizeDrag);
+ document.attachEvent("onmouseup", finishVertResizeDrag);
+ }
+ else // IE 4 Event Model
+ {
+ old_mousemove_handler = document.onmousemove;
+ old_mouseup_handler = document.onmouseup;
+ document.onmousemove = continueVertResizeDrag;
+ document.onmouseup = finishVertResizeDrag;
+ }
+
+
+ // indicate that the event has been handled
+ //
+ if (evt.stopPropagation) evt.stopPropagation(); // DOM Level 2
+ else evt.cancelBubble = true; // IE
+
+
+ // don't let any default action happen
+ //
+ if (evt.preventDefault) evt.preventDefault(); // DOM Level 2
+ else evt.returnValue = false; // IE
+
+
+ // to top it all off, return false too
+ //
+ return false;
+
+}
+
+
+
+/**
+ * Continue a (vertical only) resize of some element
+ *
+ * @param evt The JavaScript event object
+ *
+ */
+function continueVertResizeDrag(evt)
+{
+
+ // IE blows
+ //
+ if (!evt) evt = window.event;
+ if (!evt) return true;
+
+
+ // adjust height of resize item according to current mouse position
+ //
+ delta_resize = original_vert_click_pos - evt.clientY;
+ new_height = original_vert_height - delta_resize;
+ if (new_height >= min_vert_resize_height && new_height <= max_vert_resize_height)
+ element_being_vert_resized.style.height = new_height + 'px';
+
+
+ // indicate that the event has been handled
+ //
+ if (evt.stopPropagation) evt.stopPropagation(); // DOM Level 2
+ else evt.cancelBubble = true; // IE
+
+
+ // to top it all off, return false too
+ //
+ return false;
+
+}
+
+
+
+/**
+ * Finish a (vertical only) resize of some element
+ *
+ * @param evt The JavaScript event object
+ *
+ */
+function finishVertResizeDrag(evt)
+{
+
+ // IE blows
+ //
+ if (!evt) evt = window.event;
+ if (!evt) return true;
+
+
+ // restore element's original opacity
+ //
+ element_being_vert_resized.style.opacity = element_being_vert_resized_orig_opacity;
+
+
+ // unregister all event listeners
+ //
+ if (document.removeEventListener) // DOM Event Model
+ {
+ document.removeEventListener("mousemove", continueVertResizeDrag, true);
+ document.removeEventListener("mouseup", finishVertResizeDrag, true);
+ }
+ else if (document.detachEvent) // IE 5+ Event Model
+ {
+ document.detachEvent("onmousemove", continueVertResizeDrag);
+ document.detachEvent("onmouseup", finishVertResizeDrag);
+ }
+ else // IE 4 Event Model
+ {
+ document.onmousemove = old_mousemove_handler;
+ document.onmouseup = old_mouseup_handler;
+ }
+
+
+ // indicate that the event has been handled
+ //
+ if (evt.stopPropagation) evt.stopPropagation(); // DOM Level 2
+ else evt.cancelBubble = true; // IE
+
+
+ // to top it all off, return false too
+ //
+ return false;
+
+}
+
+
+
projects / squirrelmail.git / commitdiff