chrome/browser/resources/print_preview/previewarea/margin_control.js

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 cr.define('print_preview', function() {
   6   'use strict';
   7
   8   /**
   9    * Draggable control for setting a page margin.
  10    * @param {!print_preview.ticket_items.CustomMargins.Orientation} orientation
  11    *     Orientation of the margin control that determines where the margin
  12    *     textbox will be placed.
  13    * @constructor
  14    * @extends {print_preview.Component}
  15    */
  16   function MarginControl(orientation) {
  17     print_preview.Component.call(this);
  18
  19     /**
  20      * Determines where the margin textbox will be placed.
  21      * @type {!print_preview.ticket_items.CustomMargins.Orientation}
  22      * @private
  23      */
  24     this.orientation_ = orientation;
  25
  26     /**
  27      * Position of the margin control in points.
  28      * @type {number}
  29      * @private
  30      */
  31     this.positionInPts_ = 0;
  32
  33     /**
  34      * Page size of the document to print.
  35      * @type {!print_preview.Size}
  36      * @private
  37      */
  38     this.pageSize_ = new print_preview.Size(0, 0);
  39
  40     /**
  41      * Amount to scale pixel values by to convert to pixel space.
  42      * @type {number}
  43      * @private
  44      */
  45     this.scaleTransform_ = 1;
  46
  47     /**
  48      * Amount to translate values in pixel space.
  49      * @type {!print_preview.Coordinate2d}
  50      * @private
  51      */
  52     this.translateTransform_ = new print_preview.Coordinate2d(0, 0);
  53
  54     /**
  55      * Position of the margin control when dragging starts.
  56      * @type {print_preview.Coordinate2d}
  57      * @private
  58      */
  59     this.marginStartPositionInPixels_ = null;
  60
  61     /**
  62      * Position of the mouse when the dragging starts.
  63      * @type {print_preview.Coordinate2d}
  64      * @private
  65      */
  66     this.mouseStartPositionInPixels_ = null;
  67
  68     /**
  69      * Processing timeout for the textbox.
  70      * @type {?number}
  71      * @private
  72      */
  73     this.textTimeout_ = null;
  74
  75     /**
  76      * Textbox used to display and receive the value of the margin.
  77      * @type {HTMLInputElement}
  78      * @private
  79      */
  80     this.textbox_ = null;
  81
  82     /**
  83      * Element of the margin control line.
  84      * @type {HTMLElement}
  85      * @private
  86      */
  87     this.marginLineEl_ = null;
  88
  89     /**
  90      * Whether this margin control's textbox has keyboard focus.
  91      * @type {boolean}
  92      * @private
  93      */
  94     this.isFocused_ = false;
  95
  96     /**
  97      * Whether the margin control is in an error state.
  98      * @type {boolean}
  99      * @private
 100      */
 101     this.isInError_ = false;
 102   };
 103
 104   /**
 105    * Event types dispatched by the margin control.
 106    * @enum {string}
 107    */
 108   MarginControl.EventType = {
 109     // Dispatched when the margin control starts dragging.
 110     DRAG_START: 'print_preview.MarginControl.DRAG_START',
 111
 112     // Dispatched when the text in the margin control's textbox changes.
 113     TEXT_CHANGE: 'print_preview.MarginControl.TEXT_CHANGE'
 114   };
 115
 116   /**
 117    * CSS classes used by this component.
 118    * @enum {string}
 119    * @private
 120    */
 121   MarginControl.Classes_ = {
 122     TEXTBOX: 'margin-control-textbox',
 123     DRAGGING: 'margin-control-dragging',
 124     LINE: 'margin-control-line'
 125   };
 126
 127   /**
 128    * Radius of the margin control in pixels. Padding of control + 1 for border.
 129    * @type {number}
 130    * @const
 131    * @private
 132    */
 133   MarginControl.RADIUS_ = 9;
 134
 135   /**
 136    * Timeout after a text change after which the text in the textbox is saved to
 137    * the print ticket. Value in milliseconds.
 138    * @type {number}
 139    * @const
 140    * @private
 141    */
 142   MarginControl.TEXTBOX_TIMEOUT_ = 1000;
 143
 144   MarginControl.prototype = {
 145     __proto__: print_preview.Component.prototype,
 146
 147     /** @return {boolean} Whether this margin control is in focus. */
 148     getIsFocused: function() {
 149       return this.isFocused_;
 150     },
 151
 152     /**
 153      * @return {!print_preview.ticket_items.CustomMargins.Orientation}
 154      *     Orientation of the margin control.
 155      */
 156     getOrientation: function() {
 157       return this.orientation_;
 158     },
 159
 160     /**
 161      * @param {number} scaleTransform New scale transform of the margin control.
 162      */
 163     setScaleTransform: function(scaleTransform) {
 164       this.scaleTransform_ = scaleTransform;
 165       // Reset position
 166       this.setPositionInPts(this.positionInPts_);
 167     },
 168
 169     /**
 170      * @param {!print_preview.Coordinate2d} translateTransform New translate
 171      *     transform of the margin control.
 172      */
 173     setTranslateTransform: function(translateTransform) {
 174       this.translateTransform_ = translateTransform;
 175       // Reset position
 176       this.setPositionInPts(this.positionInPts_);
 177     },
 178
 179     /**
 180      * @param {!print_preview.Size} pageSize New size of the document's pages.
 181      */
 182     setPageSize: function(pageSize) {
 183       this.pageSize_ = pageSize;
 184       this.setPositionInPts(this.positionInPts_);
 185     },
 186
 187     /** @param {boolean} isVisible Whether the margin control is visible. */
 188     setIsVisible: function(isVisible) {
 189       this.getElement().classList.toggle('invisible', !isVisible);
 190     },
 191
 192     /** @return {boolean} Whether the margin control is in an error state. */
 193     getIsInError: function() {
 194       return this.isInError_;
 195     },
 196
 197     /**
 198      * @param {boolean} isInError Whether the margin control is in an error
 199      *     state.
 200      */
 201     setIsInError: function(isInError) {
 202       this.isInError_ = isInError;
 203       this.textbox_.classList.toggle('invalid', isInError);
 204     },
 205
 206     /** @param {boolean} isEnabled Whether to enable the margin control. */
 207     setIsEnabled: function(isEnabled) {
 208       this.textbox_.disabled = !isEnabled;
 209       this.getElement().classList.toggle('margin-control-disabled', !isEnabled);
 210     },
 211
 212     /** @return {number} Current position of the margin control in points. */
 213     getPositionInPts: function() {
 214       return this.positionInPts_;
 215     },
 216
 217     /**
 218      * @param {number} posInPts New position of the margin control in points.
 219      */
 220     setPositionInPts: function(posInPts) {
 221       this.positionInPts_ = posInPts;
 222       var orientationEnum =
 223           print_preview.ticket_items.CustomMargins.Orientation;
 224       var x = this.translateTransform_.x;
 225       var y = this.translateTransform_.y;
 226       var width = null, height = null;
 227       if (this.orientation_ == orientationEnum.TOP) {
 228         y = this.scaleTransform_ * posInPts + this.translateTransform_.y -
 229             MarginControl.RADIUS_;
 230         width = this.scaleTransform_ * this.pageSize_.width;
 231       } else if (this.orientation_ == orientationEnum.RIGHT) {
 232         x = this.scaleTransform_ * (this.pageSize_.width - posInPts) +
 233             this.translateTransform_.x - MarginControl.RADIUS_;
 234         height = this.scaleTransform_ * this.pageSize_.height;
 235       } else if (this.orientation_ == orientationEnum.BOTTOM) {
 236         y = this.scaleTransform_ * (this.pageSize_.height - posInPts) +
 237             this.translateTransform_.y - MarginControl.RADIUS_;
 238         width = this.scaleTransform_ * this.pageSize_.width;
 239       } else {
 240         x = this.scaleTransform_ * posInPts + this.translateTransform_.x -
 241             MarginControl.RADIUS_;
 242         height = this.scaleTransform_ * this.pageSize_.height;
 243       }
 244       this.getElement().style.left = Math.round(x) + 'px';
 245       this.getElement().style.top = Math.round(y) + 'px';
 246       if (width != null) {
 247         this.getElement().style.width = Math.round(width) + 'px';
 248       }
 249       if (height != null) {
 250         this.getElement().style.height = Math.round(height) + 'px';
 251       }
 252     },
 253
 254     /** @return {string} The value in the margin control's textbox. */
 255     getTextboxValue: function() {
 256       return this.textbox_.value;
 257     },
 258
 259     /** @param {string} value New value of the margin control's textbox. */
 260     setTextboxValue: function(value) {
 261       if (this.textbox_.value != value) {
 262         this.textbox_.value = value;
 263       }
 264     },
 265
 266     /**
 267      * Converts a value in pixels to points.
 268      * @param {number} pixels Pixel value to convert.
 269      * @return {number} Given value expressed in points.
 270      */
 271     convertPixelsToPts: function(pixels) {
 272       var pts;
 273       var orientationEnum =
 274           print_preview.ticket_items.CustomMargins.Orientation;
 275       if (this.orientation_ == orientationEnum.TOP) {
 276         pts = pixels - this.translateTransform_.y + MarginControl.RADIUS_;
 277         pts /= this.scaleTransform_;
 278       } else if (this.orientation_ == orientationEnum.RIGHT) {
 279         pts = pixels - this.translateTransform_.x + MarginControl.RADIUS_;
 280         pts /= this.scaleTransform_;
 281         pts = this.pageSize_.width - pts;
 282       } else if (this.orientation_ == orientationEnum.BOTTOM) {
 283         pts = pixels - this.translateTransform_.y + MarginControl.RADIUS_;
 284         pts /= this.scaleTransform_;
 285         pts = this.pageSize_.height - pts;
 286       } else {
 287         pts = pixels - this.translateTransform_.x + MarginControl.RADIUS_;
 288         pts /= this.scaleTransform_;
 289       }
 290       return pts;
 291     },
 292
 293     /**
 294      * Translates the position of the margin control relative to the mouse
 295      * position in pixels.
 296      * @param {!print_preview.Coordinate2d} mousePosition New position of
 297      *     the mouse.
 298      * @return {!print_preview.Coordinate2d} New position of the margin control.
 299      */
 300     translateMouseToPositionInPixels: function(mousePosition) {
 301       return new print_preview.Coordinate2d(
 302           mousePosition.x - this.mouseStartPositionInPixels_.x +
 303               this.marginStartPositionInPixels_.x,
 304           mousePosition.y - this.mouseStartPositionInPixels_.y +
 305               this.marginStartPositionInPixels_.y);
 306     },
 307
 308     /** @override */
 309     createDom: function() {
 310       this.setElementInternal(this.cloneTemplateInternal(
 311           'margin-control-template'));
 312       this.getElement().classList.add('margin-control-' + this.orientation_);
 313       this.textbox_ = this.getElement().getElementsByClassName(
 314           MarginControl.Classes_.TEXTBOX)[0];
 315       this.textbox_.setAttribute(
 316           'aria-label', loadTimeData.getString(this.orientation_));
 317       this.marginLineEl_ = this.getElement().getElementsByClassName(
 318           MarginControl.Classes_.LINE)[0];
 319     },
 320
 321     /** @override */
 322     enterDocument: function() {
 323       print_preview.Component.prototype.enterDocument.call(this);
 324       this.tracker.add(
 325           this.getElement(), 'mousedown', this.onMouseDown_.bind(this));
 326       this.tracker.add(
 327           this.getElement(),
 328           'webkitTransitionEnd',
 329           this.onWebkitTransitionEnd_.bind(this));
 330       this.tracker.add(
 331           this.textbox_, 'input', this.onTextboxInput_.bind(this));
 332       this.tracker.add(
 333           this.textbox_, 'keydown', this.onTextboxKeyDown_.bind(this));
 334       this.tracker.add(
 335           this.textbox_, 'focus', this.setIsFocused_.bind(this, true));
 336       this.tracker.add(this.textbox_, 'blur', this.onTexboxBlur_.bind(this));
 337     },
 338
 339     /** @override */
 340     exitDocument: function() {
 341       print_preview.Component.prototype.exitDocument.call(this);
 342       this.textbox_ = null;
 343       this.marginLineEl_ = null;
 344     },
 345
 346     /**
 347      * @param {boolean} isFocused Whether the margin control is in focus.
 348      * @private
 349      */
 350     setIsFocused_: function(isFocused) {
 351       this.isFocused_ = isFocused;
 352     },
 353
 354     /**
 355      * Called whenever a mousedown event occurs on the component.
 356      * @param {MouseEvent} event The event that occured.
 357      * @private
 358      */
 359     onMouseDown_: function(event) {
 360       if (!this.textbox_.disabled &&
 361           event.button == 0 &&
 362           (event.target == this.getElement() ||
 363               event.target == this.marginLineEl_)) {
 364         this.mouseStartPositionInPixels_ =
 365             new print_preview.Coordinate2d(event.x, event.y);
 366         this.marginStartPositionInPixels_ = new print_preview.Coordinate2d(
 367             this.getElement().offsetLeft, this.getElement().offsetTop);
 368         this.setIsInError(false);
 369         cr.dispatchSimpleEvent(this, MarginControl.EventType.DRAG_START);
 370       }
 371     },
 372
 373     /**
 374      * Called when opacity CSS transition ends.
 375      * @private
 376      */
 377     onWebkitTransitionEnd_: function(event) {
 378       if (event.propertyName != 'opacity')
 379         return;
 380       var elStyle = window.getComputedStyle(this.getElement());
 381       var opacity = parseInt(elStyle.getPropertyValue('opacity'), 10);
 382       this.textbox_.setAttribute('aria-hidden', opacity == 0);
 383     },
 384
 385     /**
 386      * Called when textbox content changes. Starts text change timeout.
 387      * @private
 388      */
 389     onTextboxInput_: function(event) {
 390       if (this.textTimeout_) {
 391         clearTimeout(this.textTimeout_);
 392         this.textTimeout_ = null;
 393       }
 394       this.textTimeout_ = setTimeout(
 395           this.onTextboxTimeout_.bind(this), MarginControl.TEXTBOX_TIMEOUT_);
 396     },
 397
 398     /**
 399      * Called when a key down event occurs on the textbox. Dispatches a
 400      * TEXT_CHANGE event if the "Enter" key was pressed.
 401      * @param {Event} event Contains the key that was pressed.
 402      * @private
 403      */
 404     onTextboxKeyDown_: function(event) {
 405       if (this.textTimeout_) {
 406         clearTimeout(this.textTimeout_);
 407         this.textTimeout_ = null;
 408       }
 409       if (event.keyCode == 13 /*enter*/) {
 410         cr.dispatchSimpleEvent(this, MarginControl.EventType.TEXT_CHANGE);
 411       }
 412     },
 413
 414     /**
 415      * Called after a timeout after the text in the textbox has changed. Saves
 416      * the textbox's value to the print ticket.
 417      * @private
 418      */
 419     onTextboxTimeout_: function() {
 420       this.textTimeout_ = null;
 421       cr.dispatchSimpleEvent(this, MarginControl.EventType.TEXT_CHANGE);
 422     },
 423
 424     /**
 425      * Called when the textbox loses focus. Dispatches a TEXT_CHANGE event.
 426      */
 427     onTexboxBlur_: function() {
 428       if (this.textTimeout_) {
 429         clearTimeout(this.textTimeout_);
 430         this.textTimeout_ = null;
 431       }
 432       this.setIsFocused_(false);
 433       cr.dispatchSimpleEvent(this, MarginControl.EventType.TEXT_CHANGE);
 434     }
 435   };
 436
 437   // Export
 438   return {
 439     MarginControl: MarginControl
 440   };
 441 });