gnome-shell/js/ui/switcherPopup.js

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// -*- mode: js; js-indent-level: 4; indent-tabs-mode: nil -*-
const Clutter = imports.gi.Clutter;
const GLib = imports.gi.GLib;
const Gtk = imports.gi.Gtk;
const Lang = imports.lang;
const Mainloop = imports.mainloop;
const Meta = imports.gi.Meta;
const Shell = imports.gi.Shell;
const Signals = imports.signals;
const St = imports.gi.St;
const Main = imports.ui.main;
const Tweener = imports.ui.tweener;
const POPUP_DELAY_TIMEOUT = 150; // milliseconds
const POPUP_SCROLL_TIME = 0.10; // seconds
const POPUP_FADE_OUT_TIME = 0.1; // seconds
const DISABLE_HOVER_TIMEOUT = 500; // milliseconds
function mod(a, b) {
return (a + b) % b;
}
function primaryModifier(mask) {
if (mask == 0)
return 0;
let primary = 1;
while (mask > 1) {
mask >>= 1;
primary <<= 1;
}
return primary;
}
const SwitcherPopup = new Lang.Class({
Name: 'SwitcherPopup',
Abstract: true,
_init: function(items) {
this._switcherList = null;
this._items = items || [];
this._selectedIndex = 0;
this.actor = new Shell.GenericContainer({ style_class: 'switcher-popup',
reactive: true,
visible: false });
this.actor.connect('get-preferred-width', Lang.bind(this, this._getPreferredWidth));
this.actor.connect('get-preferred-height', Lang.bind(this, this._getPreferredHeight));
this.actor.connect('allocate', Lang.bind(this, this._allocate));
this.actor.connect('destroy', Lang.bind(this, this._onDestroy));
Main.uiGroup.add_actor(this.actor);
this._haveModal = false;
this._modifierMask = 0;
this._motionTimeoutId = 0;
this._initialDelayTimeoutId = 0;
// Initially disable hover so we ignore the enter-event if
// the switcher appears underneath the current pointer location
this._disableHover();
},
_getPreferredWidth: function(actor, forHeight, alloc) {
let primary = Main.layoutManager.primaryMonitor;
alloc.min_size = primary.width;
alloc.natural_size = primary.width;
},
_getPreferredHeight: function(actor, forWidth, alloc) {
let primary = Main.layoutManager.primaryMonitor;
alloc.min_size = primary.height;
alloc.natural_size = primary.height;
},
_allocate: function(actor, box, flags) {
let childBox = new Clutter.ActorBox();
let primary = Main.layoutManager.primaryMonitor;
let leftPadding = this.actor.get_theme_node().get_padding(St.Side.LEFT);
let rightPadding = this.actor.get_theme_node().get_padding(St.Side.RIGHT);
let bottomPadding = this.actor.get_theme_node().get_padding(St.Side.BOTTOM);
let vPadding = this.actor.get_theme_node().get_vertical_padding();
let hPadding = leftPadding + rightPadding;
// Allocate the switcherList
// We select a size based on an icon size that does not overflow the screen
let [childMinHeight, childNaturalHeight] = this._switcherList.actor.get_preferred_height(primary.width - hPadding);
let [childMinWidth, childNaturalWidth] = this._switcherList.actor.get_preferred_width(childNaturalHeight);
childBox.x1 = Math.max(primary.x + leftPadding, primary.x + Math.floor((primary.width - childNaturalWidth) / 2));
childBox.x2 = Math.min(primary.x + primary.width - rightPadding, childBox.x1 + childNaturalWidth);
childBox.y1 = primary.y + Math.floor((primary.height - childNaturalHeight) / 2);
childBox.y2 = childBox.y1 + childNaturalHeight;
this._switcherList.actor.allocate(childBox, flags);
},
_createSwitcher: function() {
throw new Error('Not implemented');
},
_initialSelection: function(backward, binding) {
throw new Error('Not implemented');
},
show: function(backward, binding, mask) {
if (!this._createSwitcher())
return false;
if (!Main.pushModal(this.actor)) {
// Probably someone else has a pointer grab, try again with keyboard only
if (!Main.pushModal(this.actor, { options: Meta.ModalOptions.POINTER_ALREADY_GRABBED })) {
return false;
}
}
this._haveModal = true;
this._modifierMask = primaryModifier(mask);
this.actor.connect('key-press-event', Lang.bind(this, this._keyPressEvent));
this.actor.connect('key-release-event', Lang.bind(this, this._keyReleaseEvent));
this.actor.connect('button-press-event', Lang.bind(this, this._clickedOutside));
this.actor.connect('scroll-event', Lang.bind(this, this._scrollEvent));
this.actor.add_actor(this._switcherList.actor);
this._switcherList.connect('item-activated', Lang.bind(this, this._itemActivated));
this._switcherList.connect('item-entered', Lang.bind(this, this._itemEntered));
// Need to force an allocation so we can figure out whether we
// need to scroll when selecting
this.actor.opacity = 0;
this.actor.show();
this.actor.get_allocation_box();
if (this._items.length > 1)
this._selectedIndex = 1;
else
this._selectedIndex = 0;
this._initialSelection(backward, binding);
// There's a race condition; if the user released Alt before
// we got the grab, then we won't be notified. (See
// https://bugzilla.gnome.org/show_bug.cgi?id=596695 for
// details.) So we check now. (Have to do this after updating
// selection.)
let [x, y, mods] = global.get_pointer();
if (!(mods & this._modifierMask)) {
this._finish(global.get_current_time());
return false;
}
// We delay showing the popup so that fast Alt+Tab users aren't
// disturbed by the popup briefly flashing.
this._initialDelayTimeoutId = Mainloop.timeout_add(POPUP_DELAY_TIMEOUT,
Lang.bind(this, function () {
Main.osdWindow.cancel();
this.actor.opacity = 255;
this._initialDelayTimeoutId = 0;
return GLib.SOURCE_REMOVE;
}));
return true;
},
_next: function() {
return mod(this._selectedIndex + 1, this._items.length);
},
_previous: function() {
return mod(this._selectedIndex - 1, this._items.length);
},
_keyPressHandler: function(keysym, backwards, action) {
throw new Error('Not implemented');
},
_keyPressEvent: function(actor, event) {
let keysym = event.get_key_symbol();
let event_state = event.get_state();
let backwards = event_state & Clutter.ModifierType.SHIFT_MASK;
let action = global.display.get_keybinding_action(event.get_key_code(), event_state);
this._disableHover();
if (keysym == Clutter.Escape)
this.destroy();
else
this._keyPressHandler(keysym, backwards, action);
return Clutter.EVENT_STOP;
},
_keyReleaseEvent: function(actor, event) {
let [x, y, mods] = global.get_pointer();
let state = mods & this._modifierMask;
if (state == 0)
this._finish(event.get_time());
return Clutter.EVENT_STOP;
},
_clickedOutside: function(actor, event) {
this.destroy();
return Clutter.EVENT_PROPAGATE;
},
_scrollHandler: function(direction) {
if (direction == Clutter.ScrollDirection.UP)
this._select(this._previous());
else if (direction == Clutter.ScrollDirection.DOWN)
this._select(this._next());
},
_scrollEvent: function(actor, event) {
this._scrollHandler(event.get_scroll_direction());
return Clutter.EVENT_PROPAGATE;
},
_itemActivatedHandler: function(n) {
this._select(n);
},
_itemActivated: function(switcher, n) {
this._itemActivatedHandler(n);
this._finish(global.get_current_time());
},
_itemEnteredHandler: function(n) {
this._select(n);
},
_itemEntered: function(switcher, n) {
if (!this.mouseActive)
return;
this._itemEnteredHandler(n);
},
_disableHover: function() {
this.mouseActive = false;
if (this._motionTimeoutId != 0)
Mainloop.source_remove(this._motionTimeoutId);
this._motionTimeoutId = Mainloop.timeout_add(DISABLE_HOVER_TIMEOUT, Lang.bind(this, this._mouseTimedOut));
},
_mouseTimedOut: function() {
this._motionTimeoutId = 0;
this.mouseActive = true;
return GLib.SOURCE_REMOVE;
},
_popModal: function() {
if (this._haveModal) {
Main.popModal(this.actor);
this._haveModal = false;
}
},
destroy: function() {
this._popModal();
if (this.actor.visible) {
Tweener.addTween(this.actor,
{ opacity: 0,
time: POPUP_FADE_OUT_TIME,
transition: 'easeOutQuad',
onComplete: Lang.bind(this,
function() {
this.actor.destroy();
})
});
} else
this.actor.destroy();
},
_finish: function(timestamp) {
this.destroy();
},
_onDestroy: function() {
this._popModal();
if (this._motionTimeoutId != 0)
Mainloop.source_remove(this._motionTimeoutId);
if (this._initialDelayTimeoutId != 0)
Mainloop.source_remove(this._initialDelayTimeoutId);
},
_select: function(num) {
this._selectedIndex = num;
this._switcherList.highlight(num);
}
});
const SwitcherList = new Lang.Class({
Name: 'SwitcherList',
_init : function(squareItems) {
this.actor = new Shell.GenericContainer({ style_class: 'switcher-list' });
this.actor.connect('get-preferred-width', Lang.bind(this, this._getPreferredWidth));
this.actor.connect('get-preferred-height', Lang.bind(this, this._getPreferredHeight));
this.actor.connect('allocate', Lang.bind(this, this._allocateTop));
// Here we use a GenericContainer so that we can force all the
// children to have the same width.
this._list = new Shell.GenericContainer({ style_class: 'switcher-list-item-container' });
this._list.spacing = 0;
this._list.connect('style-changed', Lang.bind(this, function() {
this._list.spacing = this._list.get_theme_node().get_length('spacing');
}));
this._list.connect('get-preferred-width', Lang.bind(this, this._getPreferredWidth));
this._list.connect('get-preferred-height', Lang.bind(this, this._getPreferredHeight));
this._list.connect('allocate', Lang.bind(this, this._allocate));
this._scrollView = new St.ScrollView({ style_class: 'hfade',
enable_mouse_scrolling: false });
this._scrollView.set_policy(Gtk.PolicyType.NEVER, Gtk.PolicyType.NEVER);
let scrollBox = new St.BoxLayout();
scrollBox.add_actor(this._list);
this._scrollView.add_actor(scrollBox);
this.actor.add_actor(this._scrollView);
// Those arrows indicate whether scrolling in one direction is possible
this._leftArrow = new St.DrawingArea({ style_class: 'switcher-arrow',
pseudo_class: 'highlighted' });
this._leftArrow.connect('repaint', Lang.bind(this,
function() { drawArrow(this._leftArrow, St.Side.LEFT); }));
this._rightArrow = new St.DrawingArea({ style_class: 'switcher-arrow',
pseudo_class: 'highlighted' });
this._rightArrow.connect('repaint', Lang.bind(this,
function() { drawArrow(this._rightArrow, St.Side.RIGHT); }));
this.actor.add_actor(this._leftArrow);
this.actor.add_actor(this._rightArrow);
this._items = [];
this._highlighted = -1;
this._squareItems = squareItems;
this._minSize = 0;
this._scrollableRight = true;
this._scrollableLeft = false;
},
_allocateTop: function(actor, box, flags) {
let leftPadding = this.actor.get_theme_node().get_padding(St.Side.LEFT);
let rightPadding = this.actor.get_theme_node().get_padding(St.Side.RIGHT);
let childBox = new Clutter.ActorBox();
let scrollable = this._minSize > box.x2 - box.x1;
box.y1 -= this.actor.get_theme_node().get_padding(St.Side.TOP);
box.y2 += this.actor.get_theme_node().get_padding(St.Side.BOTTOM);
this._scrollView.allocate(box, flags);
let arrowWidth = Math.floor(leftPadding / 3);
let arrowHeight = arrowWidth * 2;
childBox.x1 = leftPadding / 2;
childBox.y1 = this.actor.height / 2 - arrowWidth;
childBox.x2 = childBox.x1 + arrowWidth;
childBox.y2 = childBox.y1 + arrowHeight;
this._leftArrow.allocate(childBox, flags);
this._leftArrow.opacity = (this._scrollableLeft && scrollable) ? 255 : 0;
arrowWidth = Math.floor(rightPadding / 3);
arrowHeight = arrowWidth * 2;
childBox.x1 = this.actor.width - arrowWidth - rightPadding / 2;
childBox.y1 = this.actor.height / 2 - arrowWidth;
childBox.x2 = childBox.x1 + arrowWidth;
childBox.y2 = childBox.y1 + arrowHeight;
this._rightArrow.allocate(childBox, flags);
this._rightArrow.opacity = (this._scrollableRight && scrollable) ? 255 : 0;
},
addItem : function(item, label) {
let bbox = new St.Button({ style_class: 'item-box',
reactive: true });
bbox.set_child(item);
this._list.add_actor(bbox);
let n = this._items.length;
bbox.connect('clicked', Lang.bind(this, function() { this._onItemClicked(n); }));
bbox.connect('enter-event', Lang.bind(this, function() { this._onItemEnter(n); }));
bbox.label_actor = label;
this._items.push(bbox);
return bbox;
},
_onItemClicked: function (index) {
this._itemActivated(index);
},
_onItemEnter: function (index) {
this._itemEntered(index);
return Clutter.EVENT_PROPAGATE;
},
highlight: function(index, justOutline) {
if (this._highlighted != -1) {
this._items[this._highlighted].remove_style_pseudo_class('outlined');
this._items[this._highlighted].remove_style_pseudo_class('selected');
}
this._highlighted = index;
if (this._highlighted != -1) {
if (justOutline)
this._items[this._highlighted].add_style_pseudo_class('outlined');
else
this._items[this._highlighted].add_style_pseudo_class('selected');
}
let adjustment = this._scrollView.hscroll.adjustment;
let [value, lower, upper, stepIncrement, pageIncrement, pageSize] = adjustment.get_values();
let [absItemX, absItemY] = this._items[index].get_transformed_position();
let [result, posX, posY] = this.actor.transform_stage_point(absItemX, 0);
let [containerWidth, containerHeight] = this.actor.get_transformed_size();
if (posX + this._items[index].get_width() > containerWidth)
this._scrollToRight();
else if (this._items[index].allocation.x1 - value < 0)
this._scrollToLeft();
},
_scrollToLeft : function() {
let adjustment = this._scrollView.hscroll.adjustment;
let [value, lower, upper, stepIncrement, pageIncrement, pageSize] = adjustment.get_values();
let item = this._items[this._highlighted];
if (item.allocation.x1 < value)
value = Math.min(0, item.allocation.x1);
else if (item.allocation.x2 > value + pageSize)
value = Math.max(upper, item.allocation.x2 - pageSize);
this._scrollableRight = true;
Tweener.addTween(adjustment,
{ value: value,
time: POPUP_SCROLL_TIME,
transition: 'easeOutQuad',
onComplete: Lang.bind(this, function () {
if (this._highlighted == 0)
this._scrollableLeft = false;
this.actor.queue_relayout();
})
});
},
_scrollToRight : function() {
let adjustment = this._scrollView.hscroll.adjustment;
let [value, lower, upper, stepIncrement, pageIncrement, pageSize] = adjustment.get_values();
let item = this._items[this._highlighted];
if (item.allocation.x1 < value)
value = Math.max(0, item.allocation.x1);
else if (item.allocation.x2 > value + pageSize)
value = Math.min(upper, item.allocation.x2 - pageSize);
this._scrollableLeft = true;
Tweener.addTween(adjustment,
{ value: value,
time: POPUP_SCROLL_TIME,
transition: 'easeOutQuad',
onComplete: Lang.bind(this, function () {
if (this._highlighted == this._items.length - 1)
this._scrollableRight = false;
this.actor.queue_relayout();
})
});
},
_itemActivated: function(n) {
this.emit('item-activated', n);
},
_itemEntered: function(n) {
this.emit('item-entered', n);
},
_maxChildWidth: function (forHeight) {
let maxChildMin = 0;
let maxChildNat = 0;
for (let i = 0; i < this._items.length; i++) {
let [childMin, childNat] = this._items[i].get_preferred_width(forHeight);
maxChildMin = Math.max(childMin, maxChildMin);
maxChildNat = Math.max(childNat, maxChildNat);
if (this._squareItems) {
let [childMin, childNat] = this._items[i].get_preferred_height(-1);
maxChildMin = Math.max(childMin, maxChildMin);
maxChildNat = Math.max(childNat, maxChildNat);
}
}
return [maxChildMin, maxChildNat];
},
_getPreferredWidth: function (actor, forHeight, alloc) {
let [maxChildMin, maxChildNat] = this._maxChildWidth(forHeight);
let totalSpacing = this._list.spacing * (this._items.length - 1);
alloc.min_size = this._items.length * maxChildMin + totalSpacing;
alloc.natural_size = alloc.min_size;
this._minSize = alloc.min_size;
},
_getPreferredHeight: function (actor, forWidth, alloc) {
let maxChildMin = 0;
let maxChildNat = 0;
for (let i = 0; i < this._items.length; i++) {
let [childMin, childNat] = this._items[i].get_preferred_height(-1);
maxChildMin = Math.max(childMin, maxChildMin);
maxChildNat = Math.max(childNat, maxChildNat);
}
if (this._squareItems) {
let [childMin, childNat] = this._maxChildWidth(-1);
maxChildMin = Math.max(childMin, maxChildMin);
maxChildNat = maxChildMin;
}
alloc.min_size = maxChildMin;
alloc.natural_size = maxChildNat;
},
_allocate: function (actor, box, flags) {
let childHeight = box.y2 - box.y1;
let [maxChildMin, maxChildNat] = this._maxChildWidth(childHeight);
let totalSpacing = this._list.spacing * (this._items.length - 1);
let childWidth = Math.floor(Math.max(0, box.x2 - box.x1 - totalSpacing) / this._items.length);
let x = 0;
let children = this._list.get_children();
let childBox = new Clutter.ActorBox();
let primary = Main.layoutManager.primaryMonitor;
let parentRightPadding = this.actor.get_parent().get_theme_node().get_padding(St.Side.RIGHT);
for (let i = 0; i < children.length; i++) {
if (this._items.indexOf(children[i]) != -1) {
let [childMin, childNat] = children[i].get_preferred_height(childWidth);
let vSpacing = (childHeight - childNat) / 2;
childBox.x1 = x;
childBox.y1 = vSpacing;
childBox.x2 = x + childWidth;
childBox.y2 = childBox.y1 + childNat;
children[i].allocate(childBox, flags);
x += this._list.spacing + childWidth;
} else {
// Something else, eg, AppSwitcher's arrows;
// we don't allocate it.
}
}
}
});
Signals.addSignalMethods(SwitcherList.prototype);
function drawArrow(area, side) {
let themeNode = area.get_theme_node();
let borderColor = themeNode.get_border_color(side);
let bodyColor = themeNode.get_foreground_color();
let [width, height] = area.get_surface_size ();
let cr = area.get_context();
cr.setLineWidth(1.0);
Clutter.cairo_set_source_color(cr, borderColor);
switch (side) {
case St.Side.TOP:
cr.moveTo(0, height);
cr.lineTo(Math.floor(width * 0.5), 0);
cr.lineTo(width, height);
break;
case St.Side.BOTTOM:
cr.moveTo(width, 0);
cr.lineTo(Math.floor(width * 0.5), height);
cr.lineTo(0, 0);
break;
case St.Side.LEFT:
cr.moveTo(width, height);
cr.lineTo(0, Math.floor(height * 0.5));
cr.lineTo(width, 0);
break;
case St.Side.RIGHT:
cr.moveTo(0, 0);
cr.lineTo(width, Math.floor(height * 0.5));
cr.lineTo(0, height);
break;
}
cr.strokePreserve();
Clutter.cairo_set_source_color(cr, bodyColor);
cr.fill();
cr.$dispose();
}