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[Fixed] Add Fixed Position controller
Add controller for fixed position view (initially, as copied from Layout view.) WTD-615.
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<div style="width: 100%; height: 100%;"
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ng-controller="FixedController as controller">
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<div ng-repeat="childObject in composition"
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ng-style="controller.getStyle(childObject.getId())">
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172
platform/features/layout/src/FixedController.js
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172
platform/features/layout/src/FixedController.js
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/*global define*/
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define(
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['./LayoutDrag'],
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function (LayoutDrag) {
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"use strict";
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var DEFAULT_DIMENSIONS = [ 12, 8 ],
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DEFAULT_GRID_SIZE = [32, 32];
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/**
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* The FixedController is responsible for supporting the
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* Fixed Position view. It arranges frames according to saved
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* configuration and provides methods for updating these based on
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* mouse movement.
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* @constructor
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* @param {Scope} $scope the controller's Angular scope
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*/
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function FixedController($scope) {
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var gridSize = DEFAULT_GRID_SIZE,
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activeDrag,
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activeDragId,
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rawPositions = {},
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positions = {};
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// Utility function to copy raw positions from configuration,
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// without writing directly to configuration (to avoid triggering
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// persistence from watchers during drags).
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function shallowCopy(obj, keys) {
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var copy = {};
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keys.forEach(function (k) {
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copy[k] = obj[k];
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});
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return copy;
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}
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// Convert from { positions: ..., dimensions: ... } to an
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// apropriate ng-style argument, to position frames.
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function convertPosition(raw) {
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// Multiply position/dimensions by grid size
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return {
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left: (gridSize[0] * raw.position[0]) + 'px',
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top: (gridSize[1] * raw.position[1]) + 'px',
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width: (gridSize[0] * raw.dimensions[0]) + 'px',
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height: (gridSize[1] * raw.dimensions[1]) + 'px'
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};
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}
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// Generate a default position (in its raw format) for a frame.
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// Use an index to ensure that default positions are unique.
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function defaultPosition(index) {
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return {
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position: [index, index],
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dimensions: DEFAULT_DIMENSIONS
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};
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}
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// Store a computed position for a contained frame by its
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// domain object id. Called in a forEach loop, so arguments
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// are as expected there.
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function populatePosition(id, index) {
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rawPositions[id] =
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rawPositions[id] || defaultPosition(index || 0);
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positions[id] =
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convertPosition(rawPositions[id]);
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}
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// Compute panel positions based on the layout's object model
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function lookupPanels(model) {
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var configuration = $scope.configuration || {},
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ids = (model || {}).composition || [];
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// Pull panel positions from configuration
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rawPositions = shallowCopy(configuration.panels || {}, ids);
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// Clear prior computed positions
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positions = {};
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// Update width/height that we are tracking
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gridSize = (model || {}).layoutGrid || DEFAULT_GRID_SIZE;
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// Compute positions and add defaults where needed
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ids.forEach(populatePosition);
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}
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// Position panes when the model field changes
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$scope.$watch("model", lookupPanels);
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return {
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/**
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* Get a style object for a frame with the specified domain
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* object identifier, suitable for use in an `ng-style`
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* directive to position a frame as configured for this layout.
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* @param {string} id the object identifier
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* @returns {Object.<string, string>} an object with
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* appropriate left, width, etc fields for positioning
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*/
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getStyle: function (id) {
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// Called in a loop, so just look up; the "positions"
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// object is kept up to date by a watch.
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return positions[id];
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},
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/**
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* Start a drag gesture to move/resize a frame.
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*
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* The provided position and dimensions factors will determine
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* whether this is a move or a resize, and what type it
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* will be. For instance, a position factor of [1, 1]
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* will move a frame along with the mouse as the drag
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* proceeds, while a dimension factor of [0, 0] will leave
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* dimensions unchanged. Combining these in different
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* ways results in different handles; a position factor of
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* [1, 0] and a dimensions factor of [-1, 0] will implement
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* a left-edge resize, as the horizontal position will move
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* with the mouse while the horizontal dimensions shrink in
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* kind (and vertical properties remain unmodified.)
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*
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* @param {string} id the identifier of the domain object
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* in the frame being manipulated
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* @param {number[]} posFactor the position factor
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* @param {number[]} dimFactor the dimensions factor
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*/
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startDrag: function (id, posFactor, dimFactor) {
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activeDragId = id;
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activeDrag = new LayoutDrag(
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rawPositions[id],
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posFactor,
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dimFactor,
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gridSize
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);
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},
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/**
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* Continue an active drag gesture.
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* @param {number[]} delta the offset, in pixels,
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* of the current pointer position, relative
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* to its position when the drag started
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*/
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continueDrag: function (delta) {
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if (activeDrag) {
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rawPositions[activeDragId] =
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activeDrag.getAdjustedPosition(delta);
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populatePosition(activeDragId);
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}
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},
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/**
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* End the active drag gesture. This will update the
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* view configuration.
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*/
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endDrag: function () {
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// Write to configuration; this is watched and
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// saved by the EditRepresenter.
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$scope.configuration =
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$scope.configuration || {};
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// Make sure there is a "panels" field in the
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// view configuration.
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$scope.configuration.panels =
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$scope.configuration.panels || {};
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// Store the position of this panel.
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$scope.configuration.panels[activeDragId] =
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rawPositions[activeDragId];
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// Mark this object as dirty to encourage persistence
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if ($scope.commit) {
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$scope.commit("Moved frame.");
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}
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}
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};
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}
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return FixedController;
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}
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);
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