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[Fixed Position] Keep elements in view

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Prevent elements from being positioned at negative x/y
locations in a fixed position view, WTD-882.
This commit is contained in:
Victor Woeltjen 2015-02-24 11:38:46 -08:00
parent e56bac777e
commit 5ba58ef056
3 changed files with 23 additions and 6 deletions
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16
platform/features/layout/src/elements/AccessorMutator.js
View File

@ -8,14 +8,26 @@ define(
/**
* Utility function for creating getter-setter functions,
* since these are frequently useful for element proxies.
*
* An optional third argument may be supplied in order to
* constrain or modify arguments when using as a setter;
* this argument is a function which takes two arguments
* (the current value for the property, and the requested
* new value.) This is useful when values need to be kept
* in certain ranges; specifically, to keep x/y positions
* non-negative in a fixed position view.
*
* @constructor
* @param {Object} object the object to get/set values upon
* @param {string} key the property to get/set
* @param {function} [updater] function used to process updates
*/
function AccessorMutator(object, key) {
function AccessorMutator(object, key, updater) {
return function (value) {
if (arguments.length > 0) {
object[key] = value;
object[key] = updater ?
updater(value, object[key]) :
value;
}
return object[key];
};

9
platform/features/layout/src/elements/ElementProxy.js
View File

@ -13,6 +13,11 @@ define(
bottom: Number.NEGATIVE_INFINITY
};
// Ensure a value is non-negative (for x/y setters)
function clamp(value) {
return Math.max(value, 0);
}
/**
* Abstract superclass for other classes which provide useful
* interfaces upon an elements in a fixed position view.
@ -42,14 +47,14 @@ define(
* @param {number} [x] the new x position (if setting)
* @returns {number} the x position
*/
x: new AccessorMutator(element, 'x'),
x: new AccessorMutator(element, 'x', clamp),
/**
* Get and/or set the y position of this element.
* Units are in fixed position grid space.
* @param {number} [y] the new y position (if setting)
* @returns {number} the y position
*/
y: new AccessorMutator(element, 'y'),
y: new AccessorMutator(element, 'y', clamp),
/**
* Get and/or set the stroke color of this element.
* @param {string} [stroke] the new stroke color (if setting)

4
platform/features/layout/src/elements/LineProxy.js
View File

@ -24,7 +24,7 @@ define(
*/
proxy.x = function (v) {
var x = Math.min(element.x, element.x2),
delta = v - x;
delta = Math.max(v, 0) - x;
if (arguments.length > 0 && delta) {
element.x += delta;
element.x2 += delta;
@ -39,7 +39,7 @@ define(
*/
proxy.y = function (v) {
var y = Math.min(element.y, element.y2),
delta = v - y;
delta = Math.max(v, 0) - y;
if (arguments.length > 0 && delta) {
element.y += delta;
element.y2 += delta;