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var Ci = Components.interfaces;
var gSetBackground = {
_position : "",
_backgroundColor : 0,
_screenWidth : 0,
_screenHeight : 0,
_image : null,
_canvas : null,
get _shell()
{
return Components.classes["@mozilla.org/browser/shell-service;1"]
.getService(Ci.nsIShellService);
},
load: function ()
{
this._canvas = document.getElementById("screen");
this._screenWidth = screen.width;
this._screenHeight = screen.height;
if (this._screenWidth / this._screenHeight >= 1.6)
document.getElementById("monitor").setAttribute("aspectratio", "16:10");
// make sure that the correct dimensions will be used
setTimeout(function(self) {
self.init(window.arguments[0]);
}, 0, this);
},
init: function (aImage)
{
this._image = aImage;
// set the size of the coordinate space
this._canvas.width = this._canvas.clientWidth;
this._canvas.height = this._canvas.clientHeight;
var ctx = this._canvas.getContext("2d");
ctx.scale(this._canvas.clientWidth / this._screenWidth, this._canvas.clientHeight / this._screenHeight);
this._initColor();
this.updatePosition();
},
setDesktopBackground: function ()
{
document.persist("menuPosition", "value");
this._shell.desktopBackgroundColor = this._hexStringToLong(this._backgroundColor);
this._shell.setDesktopBackground(this._image,
Ci.nsIShellService["BACKGROUND_" + this._position]);
},
updatePosition: function ()
{
var ctx = this._canvas.getContext("2d");
ctx.clearRect(0, 0, this._screenWidth, this._screenHeight);
this._position = document.getElementById("menuPosition").value;
switch (this._position) {
case "TILE":
ctx.save();
ctx.fillStyle = ctx.createPattern(this._image, "repeat");
ctx.fillRect(0, 0, this._screenWidth, this._screenHeight);
ctx.restore();
break;
case "STRETCH":
ctx.drawImage(this._image, 0, 0, this._screenWidth, this._screenHeight);
break;
case "CENTER": {
let x = (this._screenWidth - this._image.naturalWidth) / 2;
let y = (this._screenHeight - this._image.naturalHeight) / 2;
ctx.drawImage(this._image, x, y);
break;
}
case "FILL": {
// Try maxing width first, overflow height.
let widthRatio = this._screenWidth / this._image.naturalWidth;
let width = this._image.naturalWidth * widthRatio;
let height = this._image.naturalHeight * widthRatio;
if (height < this._screenHeight) {
// Height less than screen, max height and overflow width.
let heightRatio = this._screenHeight / this._image.naturalHeight;
width = this._image.naturalWidth * heightRatio;
height = this._image.naturalHeight * heightRatio;
}
let x = (this._screenWidth - width) / 2;
let y = (this._screenHeight - height) / 2;
ctx.drawImage(this._image, x, y, width, height);
break;
}
case "FIT": {
// Try maxing width first, top and bottom borders.
let widthRatio = this._screenWidth / this._image.naturalWidth;
let width = this._image.naturalWidth * widthRatio;
let height = this._image.naturalHeight * widthRatio;
let x = 0;
let y = (this._screenHeight - height) / 2;
if (height > this._screenHeight) {
// Height overflow, maximise height, side borders.
let heightRatio = this._screenHeight / this._image.naturalHeight;
width = this._image.naturalWidth * heightRatio;
height = this._image.naturalHeight * heightRatio;
x = (this._screenWidth - width) / 2;
y = 0;
}
ctx.drawImage(this._image, x, y, width, height);
break;
}
}
}
};
gSetBackground["_initColor"] = function ()
{
var color = this._shell.desktopBackgroundColor;
const rMask = 4294901760;
const gMask = 65280;
const bMask = 255;
var r = (color & rMask) >> 16;
var g = (color & gMask) >> 8;
var b = (color & bMask);
this.updateColor(this._rgbToHex(r, g, b));
var colorpicker = document.getElementById("desktopColor");
colorpicker.color = this._backgroundColor;
};
gSetBackground["updateColor"] = function (aColor)
{
this._backgroundColor = aColor;
this._canvas.style.backgroundColor = aColor;
};
// Converts a color string in the format "#RRGGBB" to an integer.
gSetBackground["_hexStringToLong"] = function (aString)
{
return parseInt(aString.substring(1, 3), 16) << 16 |
parseInt(aString.substring(3, 5), 16) << 8 |
parseInt(aString.substring(5, 7), 16);
};
gSetBackground["_rgbToHex"] = function (aR, aG, aB)
{
return "#" + [aR, aG, aB].map(aInt => aInt.toString(16).replace(/^(.)$/, "0$1"))
.join("").toUpperCase();
};
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