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Copy pathdragdrop.js
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Copy pathdragdrop.js
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776 lines (676 loc) · 23.1 KB
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(function ($) {
AblePlayer.prototype.initDragDrop = function ( which ) {
// supported values of which: 'sign', 'transcript'
// NOTE: "Drag and Drop" for Able Player is a metaphor only!!!
// HTML5 Drag & Drop API enables moving elements to new locations in the DOM
// Thats not our purpose; we're simply changing the visible position on-screen
// Therefore, the drag & drop interface was overhauled in v2.3.41 to simply
// use mouse (and keyboard) events to change CSS positioning properties
// There are nevertheless lessons to be learned from Drag & Drop about accessibility:
// http://dev.opera.com/articles/accessible-drag-and-drop/
var thisObj, $window, $toolbar, windowName, $resizeHandle, $resizeSvg,
i, x1, y1, x2, y2, $resizeLine, resizeZIndex;
thisObj = this;
if (which === 'transcript') {
$window = this.$transcriptArea;
windowName = 'transcript-window';
$toolbar = this.$transcriptToolbar;
$toolbar.attr( 'aria-label', this.tt.transcriptControls );
} else if (which === 'sign') {
$window = this.$signWindow;
windowName = 'sign-window';
$toolbar = this.$signToolbar;
$toolbar.attr( 'aria-label', this.tt.signControls );
}
// add class to trigger change in cursor on hover
$toolbar.addClass('able-draggable');
$toolbar.attr( 'role', 'application' );
// add resize handle selector to bottom right corner
$resizeHandle = $('<div>',{
'class': 'able-resizable'
});
// fill it with three parallel diagonal lines
$resizeSvg = $('<svg>').attr({
'width': '100%',
'height': '100%',
'viewBox': '0 0 100 100',
'preserveAspectRatio': 'none'
});
for (i=1; i<=3; i++) {
if (i === 1) {
x1 = '100';
y1 = '0';
x2 = '0';
y2 = '100';
} else if (i === 2) {
x1 = '33';
y1 = '100';
x2 = '100';
y2 = '33';
} else if (i === 3) {
x1 = '67';
y1 = '100';
x2 = '100';
y2 = '67';
}
$resizeLine = $('<line>').attr({
'x1': x1,
'y1': y1,
'x2': x2,
'y2': y2,
'vector-effect': 'non-scaling-stroke'
})
$resizeSvg.append($resizeLine);
}
$resizeHandle.html($resizeSvg);
// assign z-index that's slightly higher than parent window
resizeZIndex = parseInt($window.css('z-index')) + 100;
$resizeHandle.css('z-index',resizeZIndex);
$window.append($resizeHandle);
// Final step: Need to refresh the DOM in order for browser to process & display the SVG
$resizeHandle.html($resizeHandle.html());
// add event listener to toolbar to start and end drag
// other event listeners will be added when drag starts
$toolbar.on('mousedown mouseup touchstart touchend', function(e) {
e.stopPropagation();
if (e.type === 'mousedown' || e.type === 'touchstart' ) {
if (!thisObj.windowMenuClickRegistered) {
thisObj.windowMenuClickRegistered = true;
thisObj.startMouseX = e.pageX;
thisObj.startMouseY = e.pageY;
thisObj.dragDevice = 'mouse'; // ok to use this even if device is a touchpad
thisObj.startDrag(which, $window);
}
} else if (e.type === 'mouseup' || e.type === 'touchend') {
if (thisObj.dragging && thisObj.dragDevice === 'mouse') {
thisObj.endDrag(which);
}
}
return false;
});
// add event listeners for resizing
$resizeHandle.on('mousedown mouseup touchstart touchend', function(e) {
e.stopPropagation();
if (e.type === 'mousedown' || e.type === 'touchstart') {
if (!thisObj.windowMenuClickRegistered) {
thisObj.windowMenuClickRegistered = true;
thisObj.startMouseX = e.pageX;
thisObj.startMouseY = e.pageY;
thisObj.startResize(which, $window);
}
}
else if (e.type === 'mouseup' || e.type === 'touchend') {
if (thisObj.resizing) {
thisObj.endResize(which);
}
}
return false;
});
// whenever a window is clicked, bring it to the foreground
$window.on('click', function() {
if (!thisObj.windowMenuClickRegistered && !thisObj.finishingDrag) {
thisObj.updateZIndex(which);
}
thisObj.finishingDrag = false;
});
this.addWindowMenu(which,$window,windowName);
};
AblePlayer.prototype.addWindowMenu = function(which, $window, windowName) {
var thisObj, $windowAlert, menuId, $newButton, tooltipId, $tooltip, $popup, menuId;
thisObj = this;
// Add a Boolean that will be set to true temporarily if window button or a menu item is clicked
// This will prevent the click event from also triggering a mousedown event on the toolbar
// (which would unexpectedly send the window into drag mode)
this.windowMenuClickRegistered = false;
// Add another Boolean that will be set to true temporarily when mouseup fires at the end of a drag
// this will prevent the click event from being triggered
this.finishingDrag = false;
// add button to draggable window which triggers a popup menu
menuId = this.mediaId + '-' + windowName + '-menu';
$newButton = $('<button>',{
'type': 'button',
'tabindex': '0',
'aria-haspopup': 'true',
'aria-controls': menuId,
'aria-expanded': 'false',
'class': 'able-button-handler-preferences'
});
this.getIcon( $newButton, 'preferences' );
this.setText( $newButton, this.tt.windowButtonLabel );
// add a tooltip that displays aria-label on mouseenter or focus
tooltipId = this.mediaId + '-' + windowName + '-tooltip';
$tooltip = $('<div>',{
'class' : 'able-tooltip',
'id' : tooltipId
}).hide();
$newButton.on('mouseenter focus',function(e) {
var label = $(this).attr('aria-label');
var tooltip = AblePlayer.localGetElementById($newButton[0], tooltipId).text(label);
// get height of the tooltip
var tooltipHeight = tooltip.height();
var tooltipY = ( tooltipHeight + 2 ) * -1;
var tooltipX = 0;
var tooltipStyle = {
right: '',
left: tooltipX + 'px',
top: tooltipY + 'px'
};
tooltip.css(tooltipStyle);
thisObj.showTooltip(tooltip);
$(this).on('mouseleave blur',function() {
AblePlayer.localGetElementById($newButton[0], tooltipId).text('').hide();
});
});
// setup popup menu
$popup = this.setupPopups(windowName); // 'transcript-window' or 'sign-window'
// define vars and assemble all the parts
if (which === 'transcript') {
this.$transcriptPopupButton = $newButton;
this.$transcriptPopup = $popup;
this.$transcriptToolbar.prepend($windowAlert,$newButton,$tooltip,$popup);
} else if (which === 'sign') {
this.$signPopupButton = $newButton;
this.$signPopup = $popup;
this.$signToolbar.append($windowAlert,$newButton,$tooltip,$popup);
}
// handle button click
$newButton.on('click mousedown keydown',function(e) {
if (thisObj.focusNotClick) {
return false;
}
if (thisObj.dragging) {
thisObj.dragKeys(which, e);
return false;
}
e.stopPropagation();
if (!thisObj.windowMenuClickRegistered && !thisObj.finishingDrag) {
// don't set windowMenuClickRegistered yet; that happens in handler function
thisObj.handleWindowButtonClick(which, e);
}
thisObj.finishingDrag = false;
});
this.addResizeDialog(which, $window);
};
AblePlayer.prototype.addResizeDialog = function (which, $window) {
var thisObj, $windowPopup, $windowButton,
widthId, heightId, startingWidth, startingHeight, aspectRatio,
$resizeForm, $resizeWrapper, $resizeWidthDiv, $resizeWidthInput, $resizeWidthLabel,
$resizeHeightDiv, $resizeHeightInput, $resizeHeightLabel,
tempWidth, tempHeight, $saveButton, $cancelButton, newWidth, newHeight, resizeDialog;
thisObj = this;
if (which === 'transcript') {
$windowPopup = this.$transcriptPopup;
$windowButton = this.$transcriptPopupButton;
}
else if (which === 'sign') {
$windowPopup = this.$signPopup;
$windowButton = this.$signPopupButton;
}
widthId = this.mediaId + '-resize-' + which + '-width';
heightId = this.mediaId + '-resize-' + which + '-height';
startingWidth = $window.width();
startingHeight = $window.height();
aspectRatio = startingWidth / startingHeight;
$resizeForm = $('<div></div>',{
'class' : 'able-resize-form'
});
// inner container for all content, will be assigned to modal div's aria-describedby
$resizeWrapper = $('<div></div>');
// width field
$resizeWidthDiv = $('<div></div>');
$resizeWidthInput = $('<input>',{
'type': 'text',
'id': widthId,
'value': startingWidth
});
$resizeWidthLabel = $('<label>',{
'for': widthId
}).text(this.tt.width);
// height field
$resizeHeightDiv = $('<div></div>');
$resizeHeightInput = $('<input>',{
'type': 'text',
'id': heightId,
'value': startingHeight
});
$resizeHeightLabel = $('<label>',{
'for': heightId
}).text(this.tt.height);
if (which === 'sign') {
// make height a read-only field
// and calculate its value based on width to preserve aspect ratio
$resizeHeightInput.prop('readonly',true);
$resizeWidthInput.on('input',function() {
tempWidth = $(this).val();
tempHeight = Math.round(tempWidth/aspectRatio, 0);
$resizeHeightInput.val(tempHeight);
})
}
// Add save and cancel buttons.
$saveButton = $('<button class="modal-button">' + this.tt.save + '</button>');
$cancelButton = $('<button class="modal-button">' + this.tt.cancel + '</button>');
$saveButton.on('click',function () {
newWidth = $('#' + widthId).val();
newHeight = $('#' + heightId).val();
if (newWidth !== startingWidth || newHeight !== startingHeight) {
thisObj.resizeObject(which,newWidth,newHeight);
thisObj.updateCookie(which);
}
resizeDialog.hide();
$windowPopup.hide();
$windowButton.trigger('focus');
});
$cancelButton.on('click',function () {
resizeDialog.hide();
$windowPopup.hide();
$windowButton.trigger('focus');
});
// Now assemble all the parts
$resizeWidthDiv.append($resizeWidthLabel,$resizeWidthInput);
$resizeHeightDiv.append($resizeHeightLabel,$resizeHeightInput);
$resizeWrapper.append($resizeWidthDiv,$resizeHeightDiv);
$resizeForm.append($resizeWrapper,'<hr>',$saveButton,$cancelButton);
// must be appended to the BODY!
// otherwise when aria-hidden="true" is applied to all background content
// that will include an ancestor of the dialog,
// which will render the dialog unreadable by screen readers
$('body').append($resizeForm);
resizeDialog = new AccessibleDialog($resizeForm, $windowButton, 'dialog', true, this.tt.windowResizeHeading, $resizeWrapper, this.tt.closeButtonLabel, '20em');
if (which === 'transcript') {
this.transcriptResizeDialog = resizeDialog;
}
else if (which === 'sign') {
this.signResizeDialog = resizeDialog;
}
};
AblePlayer.prototype.handleWindowButtonClick = function (which, e) {
var thisObj, $windowPopup, $windowButton, $toolbar, popupTop;
thisObj = this;
if (this.focusNotClick) {
// transcript or sign window has just opened,
// and focus moved to the window button
// ignore the keystroke that triggered the popup
return false;
}
if (which === 'transcript') {
$windowPopup = this.$transcriptPopup;
$windowButton = this.$transcriptPopupButton;
$toolbar = this.$transcriptToolbar;
}
else if (which === 'sign') {
$windowPopup = this.$signPopup;
$windowButton = this.$signPopupButton;
$toolbar = this.$signToolbar;
}
if (e.type === 'keydown') {
// user pressed a key
if (e.key === ' ' || e.key === 'Enter') {
this.windowMenuClickRegistered = true;
}
else if (e.key === 'Escape') {
if ($windowPopup.is(':visible')) {
// close the popup menu
$windowPopup.hide('fast', function() {
// also reset the Boolean
thisObj.windowMenuClickRegistered = false;
// also restore menu items to their original state
$windowPopup.find('li').removeClass('able-focus').attr('tabindex','-1');
// also return focus to window options button
$windowButton.trigger('focus');
});
}
else {
// popup isn't open. Close the window
if (which === 'sign') {
this.handleSignToggle();
}
else if (which === 'transcript') {
this.handleTranscriptToggle();
}
}
}
else {
return false;
}
}
else {
// this was a mouse event
this.windowMenuClickRegistered = true;
}
if ($windowPopup.is(':visible')) {
$windowPopup.hide(200,'',function() {
thisObj.windowMenuClickRegistered = false; // reset
});
$windowPopup.find('li').removeClass('able-focus');
$windowButton.attr('aria-expanded','false').trigger('focus');
}
else {
// first, be sure window is on top
this.updateZIndex(which);
popupTop = $toolbar.outerHeight() - 1;
$windowPopup.css('top', popupTop);
$windowPopup.show(200,'',function() {
$windowButton.attr('aria-expanded','true');
$(this).find('li').first().trigger('focus').addClass('able-focus');
thisObj.windowMenuClickRegistered = false; // reset
});
}
};
AblePlayer.prototype.handleMenuChoice = function (which, choice, e) {
var thisObj, $window, $windowPopup, $windowButton, resizeDialog;
thisObj = this;
if (which === 'transcript') {
$window = this.$transcriptArea;
$windowPopup = this.$transcriptPopup;
$windowButton = this.$transcriptPopupButton;
resizeDialog = this.transcriptResizeDialog;
}
else if (which === 'sign') {
$window = this.$signWindow;
$windowPopup = this.$signPopup;
$windowButton = this.$signPopupButton;
resizeDialog = this.signResizeDialog;
}
this.$activeWindow = $window;
if (e.type === 'keydown') {
if (e.key === 'Escape') { // escape
// hide the popup menu
$windowPopup.hide('fast', function() {
// also reset the Boolean
thisObj.windowMenuClickRegistered = false;
// also restore menu items to their original state
$windowPopup.find('li').removeClass('able-focus').attr('tabindex','-1');
$windowButton.attr('aria-expanded','false');
// also return focus to window options button
$windowButton.trigger('focus');
});
return false;
}
else {
// all other keys will be handled by upstream functions
if (choice !== 'close') {
this.$activeWindow = $window;
}
return false;
}
}
// hide the popup menu
$windowPopup.hide('fast', function() {
// also reset the boolean
thisObj.windowMenuClickRegistered = false;
// also restore menu items to their original state
$windowPopup.find('li').removeClass('able-focus').attr('tabindex','-1');
$windowButton.attr('aria-expanded','false');
});
if (choice !== 'close') {
$windowButton.trigger('focus');
}
if (choice === 'move') {
// temporarily add role="application" to activeWindow
// otherwise, screen readers incercept arrow keys and moving window will not work
this.$activeWindow.attr('role','application');
if (!this.showedAlert(which)) {
this.showAlert(this.tt.windowMoveAlert,which);
if (which === 'transcript') {
this.showedTranscriptAlert = true;
}
else if (which === 'sign') {
this.showedSignAlert = true;
}
}
this.dragDevice = (e.type === 'keydown') ? 'keyboard' : 'mouse';
this.startDrag(which, $window);
$windowPopup.hide().parent().attr( 'tabindex', '-1' ).trigger('focus');
}
else if (choice == 'resize') {
// resize through the menu uses a form, not drag
var resizeFields = resizeDialog.getInputs();
if (resizeFields) {
// reset width and height values in form
resizeFields[0].value = $window.width();
resizeFields[1].value = $window.height();
}
resizeDialog.show();
}
else if (choice == 'close') {
// close window, place focus on corresponding button on controller bar
if (which === 'transcript') {
this.closingTranscript = true; // stopgrap to prevent double-firing of keypress
this.handleTranscriptToggle();
}
else if (which === 'sign') {
this.closingSign = true; // stopgrap to prevent double-firing of keypress
this.handleSignToggle();
}
}
};
AblePlayer.prototype.startDrag = function(which, $element) {
var thisObj, $windowPopup, startPos, newX, newY;
thisObj = this;
if (!this.$activeWindow) {
this.$activeWindow = $element;
}
this.dragging = true;
if (which === 'transcript') {
$windowPopup = this.$transcriptPopup;
}
else if (which === 'sign') {
$windowPopup = this.$signPopup;
}
// if window's popup menu is open, close it
if ($windowPopup.is(':visible')) {
$windowPopup.hide();
}
// be sure this window is on top
this.updateZIndex(which);
// get starting position of element
startPos = this.$activeWindow.position();
this.dragStartX = startPos.left;
this.dragStartY = startPos.top;
if (typeof this.startMouseX === 'undefined') {
this.dragDevice = 'keyboard';
this.dragKeyX = this.dragStartX;
this.dragKeyY = this.dragStartY;
// add stopgap to prevent the Enter that triggered startDrag() from also triggering dragEnd()
this.startingDrag = true;
} else {
this.dragDevice = 'mouse';
// get offset between mouse position and top left corner of draggable element
this.dragOffsetX = this.startMouseX - this.dragStartX;
this.dragOffsetY = this.startMouseY - this.dragStartY;
}
// prepare element for dragging
this.$activeWindow.addClass('able-drag').css({
'position': 'absolute',
'top': this.dragStartY + 'px',
'left': this.dragStartX + 'px'
}).trigger('focus');
var dragDevice = this.dragDevice;
// add device-specific event listeners
if (this.dragDevice === 'mouse') { // might also be a touchpad
$(document).on('mousemove touchmove',function(e) {
if (thisObj.dragging) {
// calculate new top left based on current mouse position - offset
newX = e.pageX - thisObj.dragOffsetX;
newY = e.pageY - thisObj.dragOffsetY;
thisObj.resetDraggedObject( newX, newY );
}
});
} else if (this.dragDevice === 'keyboard') {
this.$activeWindow.on('keydown',function(e) {
if (thisObj.dragging) {
thisObj.dragKeys(which, e);
}
});
}
return false;
};
/**
* Handle moving the transcript or sign window from the keyboard.
*
* @param {string} which 'transcript' or 'sign' window.
* @param {Event} e Triggered event.
*/
AblePlayer.prototype.dragKeys = function(which, e) {
var key, keySpeed;
var thisObj = this;
// stopgap to prevent firing on initial Enter or space
// that selected "Move" from menu
if (this.startingDrag) {
this.startingDrag = false;
return false;
}
key = e.key;
keySpeed = 10; // pixels per keypress event
switch (key) {
case 'ArrowLeft': // left
this.dragKeyX -= keySpeed;
this.$srAlertBox.text( this.tt.windowMoveLeft );
break;
case 'ArrowUp': // up
this.dragKeyY -= keySpeed;
this.$srAlertBox.text( this.tt.windowMoveUp );
break;
case 'ArrowRight': // right
this.dragKeyX += keySpeed;
this.$srAlertBox.text( this.tt.windowMoveRight );
break;
case 'ArrowDown': // down
this.dragKeyY += keySpeed;
this.$srAlertBox.text( this.tt.windowMoveDown );
break;
case 'Enter': // enter
case 'Escape': // escape
this.$srAlertBox.text( this.tt.windowMoveStopped );
this.endDrag(which);
return false;
default:
return false;
}
this.resetDraggedObject(this.dragKeyX,this.dragKeyY);
if (e.preventDefault) {
e.preventDefault();
}
return false;
};
AblePlayer.prototype.resetDraggedObject = function ( x, y) {
setTimeout( () => {
this.$srAlertBox.text( '' );
}, 2000 );
this.$activeWindow.css({
'left': x + 'px',
'top': y + 'px'
});
},
AblePlayer.prototype.resizeObject = function ( which, width, height ) {
var innerHeight;
// which is either 'transcript' or 'sign'
this.$activeWindow.css({
'width': width + 'px',
'height': height + 'px'
});
if (which === 'transcript') {
// $activeWindow is the outer $transcriptArea
// but the inner able-transcript also needs to be resized proportionally
// (it's 50px less than its outer container)
innerHeight = height - 50;
this.$transcriptDiv.css('height', innerHeight + 'px');
}
};
AblePlayer.prototype.endDrag = function(which) {
var thisObj, $windowPopup, $windowButton;
thisObj = this;
if (which === 'transcript') {
$windowPopup = this.$transcriptPopup;
$windowButton = this.$transcriptPopupButton;
}
else if (which === 'sign') {
$windowPopup = this.$signPopup;
$windowButton = this.$signPopupButton;
}
$(document).off('mousemove mouseup touchmove touchup');
this.$activeWindow.off('keydown').removeClass('able-drag');
// restore activeWindow role from 'application' to 'dialog'
this.$activeWindow.attr('role','dialog');
this.$activeWindow = null;
if (this.dragDevice === 'keyboard') {
$windowButton.trigger('focus');
}
this.dragging = false;
// save final position of dragged element
this.updateCookie(which);
// reset starting mouse positions
this.startMouseX = undefined;
this.startMouseY = undefined;
// Boolean to stop stray events from firing
this.windowMenuClickRegistered = false;
this.finishingDrag = true; // will be reset after window click event
// finishingDrag should be reset after window click event,
// which is triggered automatically after mouseup
// However, in case that's not reliable in some browsers
// need to ensure this gets cancelled
setTimeout(function() {
thisObj.finishingDrag = false;
}, 100);
};
AblePlayer.prototype.startResize = function(which, $element) {
var thisObj, $windowPopup, startPos, newWidth, newHeight;
thisObj = this;
this.$activeWindow = $element;
this.resizing = true;
if (which === 'transcript') {
$windowPopup = this.$transcriptPopup;
}
else if (which === 'sign') {
$windowPopup = this.$signPopup;
}
// if window's popup menu is open, close it & place focus on button (???)
if ($windowPopup.is(':visible')) {
$windowPopup.hide().parent().trigger('focus');
}
// get starting width and height
startPos = this.$activeWindow.position();
this.dragKeyX = this.dragStartX;
this.dragKeyY = this.dragStartY;
this.dragStartWidth = this.$activeWindow.width();
this.dragStartHeight = this.$activeWindow.outerHeight();
// add event listeners
$(document).on('mousemove touchmove',function(e) {
if (thisObj.resizing) {
// calculate new width and height based on changes to mouse position
newWidth = thisObj.dragStartWidth + (e.pageX - thisObj.startMouseX);
newHeight = thisObj.dragStartHeight + (e.pageY - thisObj.startMouseY);
thisObj.resizeObject( which, newWidth, newHeight );
}
});
return false;
};
AblePlayer.prototype.endResize = function(which) {
var $windowPopup, $windowButton;
if (which === 'transcript') {
$windowPopup = this.$transcriptPopup;
$windowButton = this.$transcriptPopupButton;
}
else if (which === 'sign') {
$windowPopup = this.$signPopup;
$windowButton = this.$signPopupButton;
}
$(document).off('mousemove mouseup touchmove touchup');
this.$activeWindow.off('keydown');
$windowButton.show().trigger('focus');
this.resizing = false;
this.$activeWindow.removeClass('able-resize');
// save final width and height of dragged element
this.updateCookie(which);
// Booleans for preventing stray events
this.windowMenuClickRegistered = false;
this.finishingDrag = true;
// finishingDrag should e reset after window click event,
// which is triggered automatically after mouseup
// However, in case that's not reliable in some browsers
// need to ensure this gets cancelled
setTimeout(function() {
this.finishingDrag = false;
}, 100);
};
})(jQuery);