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// Copyright 2016 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
/**
* @fileoverview
* 'display-layout' presents a visual representation of the layout of one or
* more displays and allows them to be arranged.
*/
(function() {
/** @const {number} */ var MIN_VISUAL_SCALE = .01;
Polymer({
is: 'display-layout',
behaviors: [
Polymer.IronResizableBehavior,
DragBehavior,
LayoutBehavior,
],
properties: {
/**
* Array of displays.
* @type {!Array<!chrome.system.display.DisplayUnitInfo>}
*/
displays: Array,
/** @type {!chrome.system.display.DisplayUnitInfo|undefined} */
selectedDisplay: Object,
/**
* The ratio of the display area div (in px) to DisplayUnitInfo.bounds.
* @type {number}
*/
visualScale: 1,
},
/** @private {!{left: number, top: number}} */
visualOffset_: {left: 0, top: 0},
/** @override */
detached: function() { this.initializeDrag(false); },
/**
* Called explicitly when |this.displays| and their associated |this.layouts|
* have been fetched from chrome.
* @param {!Array<!chrome.system.display.DisplayUnitInfo>} displays
* @param {!Array<!chrome.system.display.DisplayLayout>} layouts
*/
updateDisplays: function(displays, layouts) {
this.displays = displays;
this.layouts = layouts;
this.initializeDisplayLayout(displays, layouts);
var self = this;
var retry = 100; // ms
function tryCalcVisualScale() {
if (!self.calculateVisualScale_())
setTimeout(tryCalcVisualScale, retry);
}
tryCalcVisualScale();
this.initializeDrag(
!this.mirroring, this.$.displayArea, this.onDrag_.bind(this));
},
/**
* Calculates the visual offset and scale for the display area
* (i.e. the ratio of the display area div size to the area required to
* contain the DisplayUnitInfo bounding boxes).
* @return {boolean} Whether the calculation was successful.
* @private
*/
calculateVisualScale_() {
var displayAreaDiv = this.$.displayArea;
if (!displayAreaDiv || !displayAreaDiv.offsetWidth || !this.displays ||
!this.displays.length) {
return false;
}
var display = this.displays[0];
var bounds = this.getCalculatedDisplayBounds(display.id);
var boundsBoundingBox = {
left: bounds.left,
right: bounds.left + bounds.width,
top: bounds.top,
bottom: bounds.top + bounds.height,
};
var maxWidth = bounds.width;
var maxHeight = bounds.height;
for (let i = 1; i < this.displays.length; ++i) {
display = this.displays[i];
bounds = this.getCalculatedDisplayBounds(display.id);
boundsBoundingBox.left = Math.min(boundsBoundingBox.left, bounds.left);
boundsBoundingBox.right =
Math.max(boundsBoundingBox.right, bounds.left + bounds.width);
boundsBoundingBox.top = Math.min(boundsBoundingBox.top, bounds.top);
boundsBoundingBox.bottom =
Math.max(boundsBoundingBox.bottom, bounds.top + bounds.height);
maxWidth = Math.max(maxWidth, bounds.width);
maxHeight = Math.max(maxHeight, bounds.height);
}
// Create a margin around the bounding box equal to the size of the
// largest displays.
var boundsWidth = boundsBoundingBox.right - boundsBoundingBox.left;
var boundsHeight = boundsBoundingBox.bottom - boundsBoundingBox.top;
// Calculate the scale.
var horizontalScale =
displayAreaDiv.offsetWidth / (boundsWidth + maxWidth * 2);
var verticalScale =
displayAreaDiv.offsetHeight / (boundsHeight + maxHeight * 2);
var scale = Math.min(horizontalScale, verticalScale);
// Calculate the offset.
this.visualOffset_.left =
((displayAreaDiv.offsetWidth - (boundsWidth * scale)) / 2) -
boundsBoundingBox.left * scale;
this.visualOffset_.top =
((displayAreaDiv.offsetHeight - (boundsHeight * scale)) / 2) -
boundsBoundingBox.top * scale;
// Update the scale which will trigger calls to getDivStyle_.
this.visualScale = Math.max(MIN_VISUAL_SCALE, scale);
return true;
},
/**
* @param {string} id
* @param {!chrome.system.display.Bounds} displayBounds
* @param {number} visualScale
* @param {boolean=} opt_mirrored
* @return {string} The style string for the div.
* @private
*/
getDivStyle_: function(id, displayBounds, visualScale, opt_mirrored) {
// This matches the size of the box-shadow or border in CSS.
/** @const {number} */ var BORDER = 1;
/** @const {number} */ var MARGIN = 4;
/** @const {number} */ var OFFSET = opt_mirrored ? -4 : 0;
/** @const {number} */ var PADDING = 3;
var bounds = this.getCalculatedDisplayBounds(id, true /* notest */);
if (!bounds)
return '';
var height = Math.round(bounds.height * this.visualScale) - BORDER * 2 -
MARGIN * 2 - PADDING * 2;
var width = Math.round(bounds.width * this.visualScale) - BORDER * 2 -
MARGIN * 2 - PADDING * 2;
var left = OFFSET +
Math.round(this.visualOffset_.left + (bounds.left * this.visualScale));
var top = OFFSET +
Math.round(this.visualOffset_.top + (bounds.top * this.visualScale));
return `height: ${height}px; width: ${width}px;` +
` left: ${left}px; top: ${top}px`;
},
/**
* @param {string} id
* @param {!chrome.system.display.Bounds} displayBounds
* @param {number} visualScale
* @return {string} The style string for the mirror div.
* @private
*/
getMirrorDivStyle_: function(id, displayBounds, visualScale) {
return this.getDivStyle_(id, displayBounds, visualScale, true);
},
/**
* @param {!chrome.system.display.DisplayUnitInfo} display
* @param {!chrome.system.display.DisplayUnitInfo} selectedDisplay
* @return {boolean}
* @private
*/
isSelected_: function(display, selectedDisplay) {
return display.id == selectedDisplay.id;
},
/**
* @param {!{model: !{item: !chrome.system.display.DisplayUnitInfo},
* target: !HTMLDivElement}} e
* @private
*/
onSelectDisplayTap_: function(e) {
this.fire('select-display', e.model.item.id);
// Force active in case the selected display was clicked.
// TODO(dpapad): Ask @stevenjb, why are we setting 'active' on a div?
e.target.active = true;
},
/**
* @param {string} id
* @param {?DragPosition} amount
*/
onDrag_: function(id, amount) {
id = id.substr(1); // Skip prefix
var newBounds;
if (!amount) {
this.finishUpdateDisplayBounds(id);
newBounds = this.getCalculatedDisplayBounds(id);
} else {
// Make sure the dragged display is also selected.
if (id != this.selectedDisplay.id)
this.fire('select-display', id);
var calculatedBounds = this.getCalculatedDisplayBounds(id);
newBounds =
/** @type {chrome.system.display.Bounds} */ (
Object.assign({}, calculatedBounds));
newBounds.left += Math.round(amount.x / this.visualScale);
newBounds.top += Math.round(amount.y / this.visualScale);
newBounds = this.updateDisplayBounds(id, newBounds);
}
var left =
this.visualOffset_.left + Math.round(newBounds.left * this.visualScale);
var top =
this.visualOffset_.top + Math.round(newBounds.top * this.visualScale);
var div = this.$$('#_' + id);
div.style.left = '' + left + 'px';
div.style.top = '' + top + 'px';
},
});
})();
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