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// Copyright (c) 2011 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.
cr.define('print_preview', function() {
'strict';
/**
* @constructor
* This class represents a margin line and a textbox corresponding to that
* margin.
*/
function MarginsUIPair(groupName) {
var marginsUIPair = document.createElement('div');
marginsUIPair.__proto__ = MarginsUIPair.prototype;
marginsUIPair.className = MarginsUIPair.CSS_CLASS;
// @type {string} Specifies which margin this line refers to.
marginsUIPair.marginGroup = groupName;
marginsUIPair.classList.add(groupName);
// @type {print_preview.Rect} A rectangle describing the dimensions of
// the draggable area.
marginsUIPair.rectangle = null;
// @type {print_preview.Rect} A rectangle describing the four margins.
marginsUIPair.marginsRectangle = null;
// @type {HTMLDivElement} The line representing the margin.
marginsUIPair.line_ = document.createElement('div');
marginsUIPair.line_.className = 'margin-line';
// @type {print_preview.MarginTextbox} The textbox corresponding to this
// margin.
marginsUIPair.box_ = new print_preview.MarginTextbox(groupName);
// @type {{x: number, y: number}} The point where mousedown occured within
// the draggable area with respect the top-left corner of |this|.
marginsUIPair.mousePointerOffset = null;
// @type {{x: number, y:number}} The position of the origin before any
// dragging in progress occured.
marginsUIPair.originBeforeDragging = null;
marginsUIPair.appendChild(marginsUIPair.line_);
marginsUIPair.appendChild(marginsUIPair.box_);
marginsUIPair.addEventListeners_();
return marginsUIPair;
}
MarginsUIPair.CSS_CLASS = 'margins-ui-pair';
// Width of the clickable region around each margin line in screen pixels.
MarginsUIPair.CLICKABLE_REGION = 20;
MarginsUIPair.prototype = {
__proto__: HTMLDivElement.prototype,
/**
* Updates the state.
*/
update: function(marginsRectangle, value, valueLimit, keepDisplayedValue,
valueLimitInPercent) {
this.marginsRectangle = marginsRectangle;
this.valueLimitInPercent = valueLimitInPercent;
this.rectangle = this.getCoordinates_(this.marginsRectangle);
this.box_.update(value, valueLimit, keepDisplayedValue);
},
/**
* Draws |this| based on the state.
*/
draw: function() {
this.drawDraggableArea_();
this.box_.draw();
},
/**
* Draws the area that can be clicked in order to start dragging.
* @private
*/
drawDraggableArea_: function() {
var width = previewArea.pdfPlugin_.offsetWidth;
var height = previewArea.pdfPlugin_.offsetHeight;
this.style.left = Math.round(this.rectangle.x * width) + 'px';
this.style.top = Math.round(this.rectangle.y * height) + 'px';
this.style.width = Math.round(this.rectangle.width * width) + 'px';
this.style.height = Math.round(this.rectangle.height * height) + 'px';
},
/**
* Calculates the coordinates and size of |this|.
* @param {print_preview.Rect} marginsRectangle A rectangle describing the
* selected margins values in percentages.
* @private
*/
getCoordinates_: function(marginsRectangle) {
var pageLocation = previewArea.pageLocationNormalized;
var totalWidth = previewArea.pdfPlugin_.offsetWidth;
var totalHeight = previewArea.pdfPlugin_.offsetHeight;
var offsetY = (MarginsUIPair.CLICKABLE_REGION / 2) / totalHeight;
var offsetX = (MarginsUIPair.CLICKABLE_REGION / 2) / totalWidth;
if (this.isTop_()) {
var lineCoordinates = new print_preview.Rect(
pageLocation.x,
marginsRectangle.y - offsetY,
pageLocation.width,
MarginsUIPair.CLICKABLE_REGION / totalHeight);
} else if (this.isBottom_()) {
var lineCoordinates = new print_preview.Rect(
pageLocation.x,
marginsRectangle.bottom - offsetY,
pageLocation.width,
MarginsUIPair.CLICKABLE_REGION / totalHeight);
} else if (this.isRight_()) {
var lineCoordinates = new print_preview.Rect(
marginsRectangle.right - offsetX,
pageLocation.y,
MarginsUIPair.CLICKABLE_REGION / totalWidth,
pageLocation.height);
} else if (this.isLeft_()) {
var lineCoordinates = new print_preview.Rect(
marginsRectangle.x - offsetX,
pageLocation.y,
MarginsUIPair.CLICKABLE_REGION / totalWidth,
pageLocation.height);
}
return lineCoordinates;
},
/**
* @return {boolean} True if |this| refers to the top margin.
* @private
*/
isTop_: function() {
return this.marginGroup == print_preview.MarginSettings.TOP_GROUP;
},
/**
* @return {boolean} True if |this| refers to the bottom margin.
* @private
*/
isBottom_: function() {
return this.marginGroup == print_preview.MarginSettings.BOTTOM_GROUP;
},
/**
* @return {boolean} True if |this| refers to the left margin.
* @private
*/
isLeft_: function() {
return this.marginGroup == print_preview.MarginSettings.LEFT_GROUP;
},
/**
* @return {boolean} True if |this| refers to the bottom margin.
* @private
*/
isRight_: function() {
return this.marginGroup == print_preview.MarginSettings.RIGHT_GROUP;
},
/**
* Adds event listeners for events related to dragging.
*/
addEventListeners_: function() {
this.onmousedown = this.onMouseDown_.bind(this);
},
/**
* Executes whenever a mousedown event occurs on |this| or its child nodes.
* @parameter {MouseEvent} e The event that occured.
*/
onMouseDown_: function(e) {
if (e.button != 0)
return;
if (e.target != this)
return;
var point = print_preview.MarginsUI.convert({x: e.x, y: e.y});
this.originBeforeDragging = { x: this.offsetLeft, y: this.offsetTop };
this.mousePointerOffset =
{ x: point.x - this.offsetLeft, y: point.y - this.offsetTop };
cr.dispatchSimpleEvent(this, customEvents.MARGIN_LINE_MOUSE_DOWN);
},
/**
* Executes whenever a mouseup event occurs while |this| is dragged.
*/
onMouseUp: function() {
this.box_.onTextValueMayHaveChanged();
},
/**
* Moves |this| including all its children to |point|.
* @param {{x: number, y: number}} point The point where |this| should be
* moved.
*/
moveTo: function(point) {
if (this.isTop_() || this.isBottom_())
this.style.top = point.y - this.mousePointerOffset.y + 'px';
else
this.style.left = point.x - this.mousePointerOffset.x + 'px';
},
/**
* @param {{x: number, y: number}} rhs The point to compare with.
* @return {number} The horizontal or vertical displacement in pixels
* between |this.originBeforeDragging| and |rhs|. Note: Bottom margin
* grows upwards, right margin grows when going to the left.
*/
getDragDisplacementFrom: function(rhs) {
var dragDisplacement = 0;
if (this.isTop_() || this.isBottom_()) {
dragDisplacement = (rhs.y - this.originBeforeDragging.y -
this.mousePointerOffset.y) / previewArea.height;
} else {
dragDisplacement = (rhs.x - this.originBeforeDragging.x -
this.mousePointerOffset.x) / previewArea.width;
}
if (this.isBottom_() || this.isRight_())
dragDisplacement *= -1;
return dragDisplacement;
},
/**
* Updates |this| while dragging is in progress. Takes care of rejecting
* invalid margin values.
* @param {number} dragDeltaInPoints The difference in points between the
* currently applied margin and the margin indicated by
* |destinationPoint|.
* @param {{x: number, y: number}} destinationPoint The point where the
* margin line should be drawn if |dragDeltaInPoints| is applied.
*/
updateWhileDragging: function(dragDeltaInPoints, destinationPoint) {
this.box_.updateWhileDragging(dragDeltaInPoints);
var validity = this.box_.validateDelta(dragDeltaInPoints);
if (validity == print_preview.marginValidationStates.WITHIN_RANGE)
this.moveTo(destinationPoint);
else if (validity == print_preview.marginValidationStates.TOO_SMALL)
this.snapToMinValue_();
else if (validity == print_preview.marginValidationStates.TOO_BIG)
this.snapToMaxValue_();
},
/**
* Snaps |this| to the minimum allowed margin value (0). Happens whenever
* the user drags the margin line to a smaller value than the minimum
* allowed.
* @private
*/
snapToMinValue_: function() {
var pageInformation = previewArea.pageLocationNormalized;
var newMarginsRectangle = this.marginsRectangle.clone();
if (this.isTop_()) {
newMarginsRectangle.y = pageInformation.y;
} else if (this.isLeft_()) {
newMarginsRectangle.x = pageInformation.x;
} else if (this.isRight_()) {
newMarginsRectangle.x = pageInformation.x;
newMarginsRectangle.width = pageInformation.width;
} else if (this.isBottom_()) {
newMarginsRectangle.y = pageInformation.y;
newMarginsRectangle.height = pageInformation.height;
}
this.rectangle = this.getCoordinates_(newMarginsRectangle);
this.drawDraggableArea_();
},
/**
* Snaps |this| to the maximum allowed margin value. Happens whenever
* the user drags the margin line to a larger value than the maximum
* allowed.
* @private
*/
snapToMaxValue_: function() {
var newMarginsRectangle = this.marginsRectangle.clone();
if (this.isTop_()) {
newMarginsRectangle.y = this.valueLimitInPercent;
} else if (this.isLeft_()) {
newMarginsRectangle.x = this.valueLimitInPercent;
} else if (this.isRight_()) {
newMarginsRectangle.x = 0;
newMarginsRectangle.width = this.valueLimitInPercent;
} else if (this.isBottom_()) {
newMarginsRectangle.y = 0;
newMarginsRectangle.height = this.valueLimitInPercent;
}
this.rectangle = this.getCoordinates_(newMarginsRectangle);
this.drawDraggableArea_();
},
};
return {
MarginsUIPair: MarginsUIPair
};
});
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