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[Fixed Position] Initially implement handles

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Initially implement handles for resizing elements in a fixed
position view, WTD-882.
This commit is contained in:
Victor Woeltjen
2015-02-24 11:00:36 -08:00
parent abad8df135
commit 5e3d5fd00f
5 changed files with 172 additions and 7 deletions
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52
platform/features/layout/src/FixedDragHandle.js
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@ -15,8 +15,10 @@ define(
* @constructor
*/
function FixedDragHandle(elementHandle, gridSize, commit) {
var self = {};
var self = {},
dragging;
// Generate ng-style-appropriate style for positioning
function getStyle() {
// Adjust from grid to pixel coordinates
var x = elementHandle.x() * gridSize[0],
@ -25,14 +27,39 @@ define(
// Convert to a CSS style centered on that point
return {
left: (x - DRAG_HANDLE_SIZE[0] / 2) + 'px',
right: (x - DRAG_HANDLE_SIZE[1] / 2) + 'px',
top: (y - DRAG_HANDLE_SIZE[1] / 2) + 'px',
width: DRAG_HANDLE_SIZE[0] + 'px',
height: DRAG_HANDLE_SIZE[1] + 'px'
};
}
function noop() {
// Begin a drag gesture
function startDrag() {
// Cache initial x/y positions
dragging = { x: elementHandle.x(), y: elementHandle.y() };
}
// Reposition during drag
function continueDrag(delta) {
if (dragging) {
// Update x/y positions (snapping to grid)
elementHandle.x(
dragging.x + Math.round(delta[0] / gridSize[0])
);
elementHandle.y(
dragging.y + Math.round(delta[1] / gridSize[1])
);
}
}
// Conclude a drag gesture
function endDrag() {
// Clear cached state
dragging = undefined;
// Mark change as complete
if (commit) {
commit("Dragged handle.");
}
}
return {
@ -41,9 +68,22 @@ define(
* @returns CSS style object (for `ng-style`)
*/
style: getStyle,
startDrag: noop,
continueDrag: noop,
endDrag: noop
/**
* Start a drag gesture. This should be called when a drag
* begins to track initial state.
*/
startDrag: startDrag,
/**
* Continue a drag gesture; update x/y positions.
* @param {number[]} delta x/y pixel difference since drag
* started
*/
continueDrag: continueDrag,
/**
* End a drag gesture. This should be callled when a drag
* concludes to trigger commit of changes.
*/
endDrag: endDrag
};
}