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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
"use strict";
this.EXPORTED_SYMBOLS = [
"SelectParentHelper"
];
// Maximum number of rows to display in the select dropdown.
const MAX_ROWS = 20;
var currentBrowser = null;
var currentMenulist = null;
var currentZoom = 1;
var closedWithEnter = false;
this.SelectParentHelper = {
populate: function(menulist, items, selectedIndex, zoom) {
// Clear the current contents of the popup
menulist.menupopup.textContent = "";
currentZoom = zoom;
currentMenulist = menulist;
populateChildren(menulist, items, selectedIndex, zoom);
},
open: function(browser, menulist, rect, isOpenedViaTouch) {
menulist.hidden = false;
currentBrowser = browser;
closedWithEnter = false;
this._registerListeners(browser, menulist.menupopup);
let win = browser.ownerDocument.defaultView;
// Set the maximum height to show exactly MAX_ROWS items.
let menupopup = menulist.menupopup;
let firstItem = menupopup.firstChild;
while (firstItem && firstItem.hidden) {
firstItem = firstItem.nextSibling;
}
if (firstItem) {
let itemHeight = firstItem.getBoundingClientRect().height;
// Include the padding and border on the popup.
let cs = win.getComputedStyle(menupopup);
let bpHeight = parseFloat(cs.borderTopWidth) + parseFloat(cs.borderBottomWidth) +
parseFloat(cs.paddingTop) + parseFloat(cs.paddingBottom);
menupopup.style.maxHeight = (itemHeight * MAX_ROWS + bpHeight) + "px";
}
menupopup.classList.toggle("isOpenedViaTouch", isOpenedViaTouch);
let constraintRect = browser.getBoundingClientRect();
constraintRect = new win.DOMRect(constraintRect.left + win.mozInnerScreenX,
constraintRect.top + win.mozInnerScreenY,
constraintRect.width, constraintRect.height);
menupopup.setConstraintRect(constraintRect);
menupopup.openPopupAtScreenRect("after_start", rect.left, rect.top, rect.width, rect.height, false, false);
},
hide: function(menulist, browser) {
if (currentBrowser == browser) {
menulist.menupopup.hidePopup();
}
},
handleEvent: function(event) {
switch (event.type) {
case "mouseover":
currentBrowser.messageManager.sendAsyncMessage("Forms:MouseOver", {});
break;
case "mouseout":
currentBrowser.messageManager.sendAsyncMessage("Forms:MouseOut", {});
break;
case "keydown":
if (event.keyCode == event.DOM_VK_RETURN) {
closedWithEnter = true;
}
break;
case "command":
if (event.target.hasAttribute("value")) {
let win = currentBrowser.ownerDocument.defaultView;
currentBrowser.messageManager.sendAsyncMessage("Forms:SelectDropDownItem", {
value: event.target.value,
closedWithEnter: closedWithEnter
});
}
break;
case "fullscreen":
if (currentMenulist) {
currentMenulist.menupopup.hidePopup();
}
break;
case "popuphidden":
currentBrowser.messageManager.sendAsyncMessage("Forms:DismissedDropDown", {});
let popup = event.target;
this._unregisterListeners(currentBrowser, popup);
popup.parentNode.hidden = true;
currentBrowser = null;
currentMenulist = null;
currentZoom = 1;
break;
}
},
receiveMessage(msg) {
if (msg.name == "Forms:UpdateDropDown") {
// Sanity check - we'd better know what the currently
// opened menulist is, and what browser it belongs to...
if (!currentMenulist || !currentBrowser) {
return;
}
let options = msg.data.options;
let selectedIndex = msg.data.selectedIndex;
this.populate(currentMenulist, options, selectedIndex, currentZoom);
}
},
_registerListeners: function(browser, popup) {
popup.addEventListener("command", this);
popup.addEventListener("popuphidden", this);
popup.addEventListener("mouseover", this);
popup.addEventListener("mouseout", this);
browser.ownerDocument.defaultView.addEventListener("keydown", this, true);
browser.ownerDocument.defaultView.addEventListener("fullscreen", this, true);
browser.messageManager.addMessageListener("Forms:UpdateDropDown", this);
},
_unregisterListeners: function(browser, popup) {
popup.removeEventListener("command", this);
popup.removeEventListener("popuphidden", this);
popup.removeEventListener("mouseover", this);
popup.removeEventListener("mouseout", this);
browser.ownerDocument.defaultView.removeEventListener("keydown", this, true);
browser.ownerDocument.defaultView.removeEventListener("fullscreen", this, true);
browser.messageManager.removeMessageListener("Forms:UpdateDropDown", this);
},
};
function populateChildren(menulist, options, selectedIndex, zoom,
parentElement = null, isGroupDisabled = false, adjustedTextSize = -1) {
let element = menulist.menupopup;
// -1 just means we haven't calculated it yet. When we recurse through this function
// we will pass in adjustedTextSize to save on recalculations.
if (adjustedTextSize == -1) {
let win = element.ownerDocument.defaultView;
// Grab the computed text size and multiply it by the remote browser's fullZoom to ensure
// the popup's text size is matched with the content's. We can't just apply a CSS transform
// here as the popup's preferred size is calculated pre-transform.
let textSize = win.getComputedStyle(element).getPropertyValue("font-size");
adjustedTextSize = (zoom * parseFloat(textSize, 10)) + "px";
}
for (let option of options) {
let isOptGroup = (option.tagName == 'OPTGROUP');
let item = element.ownerDocument.createElement(isOptGroup ? "menucaption" : "menuitem");
item.setAttribute("label", option.textContent);
item.style.direction = option.textDirection;
item.style.fontSize = adjustedTextSize;
item.hidden = option.display == "none" || (parentElement && parentElement.hidden);
item.setAttribute("tooltiptext", option.tooltip);
element.appendChild(item);
// A disabled optgroup disables all of its child options.
let isDisabled = isGroupDisabled || option.disabled;
if (isDisabled) {
item.setAttribute("disabled", "true");
}
if (isOptGroup) {
populateChildren(menulist, option.children, selectedIndex, zoom,
item, isDisabled, adjustedTextSize);
} else {
if (option.index == selectedIndex) {
// We expect the parent element of the popup to be a <xul:menulist> that
// has the popuponly attribute set to "true". This is necessary in order
// for a <xul:menupopup> to act like a proper <html:select> dropdown, as
// the <xul:menulist> does things like remember state and set the
// _moz-menuactive attribute on the selected <xul:menuitem>.
menulist.selectedItem = item;
// It's hack time. In the event that we've re-populated the menulist due
// to a mutation in the <select> in content, that means that the -moz_activemenu
// may have been removed from the selected item. Since that's normally only
// set for the initially selected on popupshowing for the menulist, and we
// don't want to close and re-open the popup, we manually set it here.
menulist.menuBoxObject.activeChild = item;
}
item.setAttribute("value", option.index);
if (parentElement) {
item.classList.add("contentSelectDropdown-ingroup")
}
}
}
}
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