| 1 | /** |
| 2 | * Library functions for resizing widgets |
| 3 | * |
| 4 | */ |
| 5 | |
| 6 | |
| 7 | |
| 8 | // event handler temporary storage variables for IE 4 |
| 9 | // |
| 10 | var old_mousemove_handler; |
| 11 | var old_mouseup_handler; |
| 12 | |
| 13 | |
| 14 | |
| 15 | // define variables used in vertical resize handlers |
| 16 | // |
| 17 | var element_being_vert_resized; |
| 18 | var element_being_vert_resized_orig_opacity; |
| 19 | var min_vert_resize_height; |
| 20 | var max_vert_resize_height; |
| 21 | var original_vert_click_pos; |
| 22 | var original_vert_height; |
| 23 | |
| 24 | |
| 25 | |
| 26 | /** |
| 27 | * Begin a (vertical only) resize of some element |
| 28 | * |
| 29 | * Note that this event handler is only intended |
| 30 | * to be called for an event (usually mousedown) |
| 31 | * that is registered as a tag attribute (not with |
| 32 | * addEventListener() and ilk). |
| 33 | * |
| 34 | * @param evt The JavaScript event object |
| 35 | * @param resize_element The element being resized |
| 36 | * @param min_height The minimum allowable resize height |
| 37 | * @param max_height The maximum allowable resize height |
| 38 | * @param handle_element The handle element that was clicked |
| 39 | * upon to initiate the resize |
| 40 | * |
| 41 | */ |
| 42 | function startVertResizeDrag(evt, resize_element, min_height, |
| 43 | max_height, handle_element) |
| 44 | { |
| 45 | |
| 46 | // assign variables used in other handlers |
| 47 | // |
| 48 | element_being_vert_resized = resize_element; |
| 49 | min_vert_resize_height = min_height; |
| 50 | max_vert_resize_height = max_height; |
| 51 | |
| 52 | |
| 53 | // dim element to emphasize effect |
| 54 | // |
| 55 | element_being_vert_resized_orig_opacity = element_being_vert_resized.style.opacity; |
| 56 | element_being_vert_resized.style.opacity = 0.25; |
| 57 | |
| 58 | |
| 59 | // detemine original vertical click coordinates |
| 60 | // |
| 61 | original_vert_click_pos = evt.clientY; |
| 62 | original_vert_height = element_being_vert_resized.offsetHeight; |
| 63 | |
| 64 | |
| 65 | // add drag and finish drag listeners |
| 66 | // |
| 67 | if (document.addEventListener) // DOM Level 2 Event Model |
| 68 | { |
| 69 | document.addEventListener('mousemove', continueVertResizeDrag, true); |
| 70 | document.addEventListener('mouseup', finishVertResizeDrag, true); |
| 71 | } |
| 72 | else if (document.attachEvent) // IE 5+ Event Model |
| 73 | { |
| 74 | document.attachEvent("onmousemove", continueVertResizeDrag); |
| 75 | document.attachEvent("onmouseup", finishVertResizeDrag); |
| 76 | } |
| 77 | else // IE 4 Event Model |
| 78 | { |
| 79 | old_mousemove_handler = document.onmousemove; |
| 80 | old_mouseup_handler = document.onmouseup; |
| 81 | document.onmousemove = continueVertResizeDrag; |
| 82 | document.onmouseup = finishVertResizeDrag; |
| 83 | } |
| 84 | |
| 85 | |
| 86 | // indicate that the event has been handled |
| 87 | // |
| 88 | if (evt.stopPropagation) evt.stopPropagation(); // DOM Level 2 |
| 89 | else evt.cancelBubble = true; // IE |
| 90 | |
| 91 | |
| 92 | // don't let any default action happen |
| 93 | // |
| 94 | if (evt.preventDefault) evt.preventDefault(); // DOM Level 2 |
| 95 | else evt.returnValue = false; // IE |
| 96 | |
| 97 | |
| 98 | // to top it all off, return false too |
| 99 | // |
| 100 | return false; |
| 101 | |
| 102 | } |
| 103 | |
| 104 | |
| 105 | |
| 106 | /** |
| 107 | * Continue a (vertical only) resize of some element |
| 108 | * |
| 109 | * @param evt The JavaScript event object |
| 110 | * |
| 111 | */ |
| 112 | function continueVertResizeDrag(evt) |
| 113 | { |
| 114 | |
| 115 | // IE blows |
| 116 | // |
| 117 | if (!evt) evt = window.event; |
| 118 | if (!evt) return true; |
| 119 | |
| 120 | |
| 121 | // adjust height of resize item according to current mouse position |
| 122 | // |
| 123 | delta_resize = original_vert_click_pos - evt.clientY; |
| 124 | new_height = original_vert_height - delta_resize; |
| 125 | if (new_height >= min_vert_resize_height && new_height <= max_vert_resize_height) |
| 126 | element_being_vert_resized.style.height = new_height + 'px'; |
| 127 | |
| 128 | |
| 129 | // indicate that the event has been handled |
| 130 | // |
| 131 | if (evt.stopPropagation) evt.stopPropagation(); // DOM Level 2 |
| 132 | else evt.cancelBubble = true; // IE |
| 133 | |
| 134 | |
| 135 | // to top it all off, return false too |
| 136 | // |
| 137 | return false; |
| 138 | |
| 139 | } |
| 140 | |
| 141 | |
| 142 | |
| 143 | /** |
| 144 | * Finish a (vertical only) resize of some element |
| 145 | * |
| 146 | * @param evt The JavaScript event object |
| 147 | * |
| 148 | */ |
| 149 | function finishVertResizeDrag(evt) |
| 150 | { |
| 151 | |
| 152 | // IE blows |
| 153 | // |
| 154 | if (!evt) evt = window.event; |
| 155 | if (!evt) return true; |
| 156 | |
| 157 | |
| 158 | // restore element's original opacity |
| 159 | // |
| 160 | element_being_vert_resized.style.opacity = element_being_vert_resized_orig_opacity; |
| 161 | |
| 162 | |
| 163 | // unregister all event listeners |
| 164 | // |
| 165 | if (document.removeEventListener) // DOM Event Model |
| 166 | { |
| 167 | document.removeEventListener("mousemove", continueVertResizeDrag, true); |
| 168 | document.removeEventListener("mouseup", finishVertResizeDrag, true); |
| 169 | } |
| 170 | else if (document.detachEvent) // IE 5+ Event Model |
| 171 | { |
| 172 | document.detachEvent("onmousemove", continueVertResizeDrag); |
| 173 | document.detachEvent("onmouseup", finishVertResizeDrag); |
| 174 | } |
| 175 | else // IE 4 Event Model |
| 176 | { |
| 177 | document.onmousemove = old_mousemove_handler; |
| 178 | document.onmouseup = old_mouseup_handler; |
| 179 | } |
| 180 | |
| 181 | |
| 182 | // indicate that the event has been handled |
| 183 | // |
| 184 | if (evt.stopPropagation) evt.stopPropagation(); // DOM Level 2 |
| 185 | else evt.cancelBubble = true; // IE |
| 186 | |
| 187 | |
| 188 | // to top it all off, return false too |
| 189 | // |
| 190 | return false; |
| 191 | |
| 192 | } |
| 193 | |
| 194 | |
| 195 | |