gnome-shell/js/ui/overview.js
Florian Müllner 6ae914da2f overview: Handle drag-cancelled signal for items
Allow handling the drag-cancelled signal for non-window items, just
like the handling for windows instroduced in commit a80e88e33.

https://bugzilla.gnome.org/show_bug.cgi?id=644324
2011-03-19 11:16:10 +01:00

728 lines
26 KiB
JavaScript

/* -*- mode: js2; js2-basic-offset: 4; indent-tabs-mode: nil -*- */
const Clutter = imports.gi.Clutter;
const Gtk = imports.gi.Gtk;
const Meta = imports.gi.Meta;
const Mainloop = imports.mainloop;
const Signals = imports.signals;
const Lang = imports.lang;
const St = imports.gi.St;
const Shell = imports.gi.Shell;
const Gettext = imports.gettext.domain('gnome-shell');
const _ = Gettext.gettext;
const Gdk = imports.gi.Gdk;
const AppDisplay = imports.ui.appDisplay;
const Dash = imports.ui.dash;
const DND = imports.ui.dnd;
const DocDisplay = imports.ui.docDisplay;
const Lightbox = imports.ui.lightbox;
const Main = imports.ui.main;
const MessageTray = imports.ui.messageTray;
const Panel = imports.ui.panel;
const PlaceDisplay = imports.ui.placeDisplay;
const Tweener = imports.ui.tweener;
const ViewSelector = imports.ui.viewSelector;
const WorkspacesView = imports.ui.workspacesView;
// Time for initial animation going into Overview mode
const ANIMATION_TIME = 0.25;
// We split the screen vertically between the dash and the view selector.
const DASH_SPLIT_FRACTION = 0.1;
const DND_WINDOW_SWITCH_TIMEOUT = 1250;
const SwipeScrollDirection = {
NONE: 0,
HORIZONTAL: 1,
VERTICAL: 2
};
const SwipeScrollResult = {
CANCEL: 0,
SWIPE: 1,
CLICK: 2
};
function ShellInfo() {
this._init();
}
ShellInfo.prototype = {
_init: function() {
this._source = null;
this._undoCallback = null;
},
_onUndoClicked: function() {
if (this._undoCallback)
this._undoCallback();
this._undoCallback = null;
if (this._source)
this._source.destroy();
},
setMessage: function(text, undoCallback, undoLabel) {
if (this._source == null) {
this._source = new MessageTray.SystemNotificationSource();
this._source.connect('destroy', Lang.bind(this,
function() {
this._source = null;
}));
Main.messageTray.add(this._source);
}
let notification = this._source.notification;
if (notification == null)
notification = new MessageTray.Notification(this._source, text, null);
else
notification.update(text, null, { clear: true });
notification.setTransient(true);
this._undoCallback = undoCallback;
if (undoCallback) {
notification.addButton('system-undo',
undoLabel ? undoLabel : _("Undo"));
notification.connect('action-invoked',
Lang.bind(this, this._onUndoClicked));
}
this._source.notify(notification);
}
};
function Overview() {
this._init();
}
Overview.prototype = {
_init : function() {
// The actual global.background_actor is inside global.window_group,
// which is hidden when displaying the overview, so we display a clone.
this._background = new Clutter.Clone({ source: global.background_actor });
this._background.hide();
global.overlay_group.add_actor(this._background);
this._desktopFade = new St.Bin();
global.overlay_group.add_actor(this._desktopFade);
this._spacing = 0;
this._group = new St.Group({ name: 'overview',
reactive: true });
this._group._delegate = this;
this._group.connect('style-changed',
Lang.bind(this, function() {
let node = this._group.get_theme_node();
let spacing = node.get_length('spacing');
if (spacing != this._spacing) {
this._spacing = spacing;
this.relayout();
}
}));
this._scrollDirection = SwipeScrollDirection.NONE;
this._scrollAdjustment = null;
this._capturedEventId = 0;
this._buttonPressId = 0;
this._workspacesDisplay = null;
this.visible = false; // animating to overview, in overview, animating out
this._shown = false; // show() and not hide()
this._shownTemporarily = false; // showTemporarily() and not hideTemporarily()
this._modal = false; // have a modal grab
this.animationInProgress = false;
this._hideInProgress = false;
// During transitions, we raise this to the top to avoid having the overview
// area be reactive; it causes too many issues such as double clicks on
// Dash elements, or mouseover handlers in the workspaces.
this._coverPane = new Clutter.Rectangle({ opacity: 0,
reactive: true });
this._group.add_actor(this._coverPane);
this._coverPane.connect('event', Lang.bind(this, function (actor, event) { return true; }));
this._group.hide();
global.overlay_group.add_actor(this._group);
this._coverPane.hide();
// XDND
this._dragMonitor = {
dragMotion: Lang.bind(this, this._onDragMotion)
};
Main.xdndHandler.connect('drag-begin', Lang.bind(this, this._onDragBegin));
Main.xdndHandler.connect('drag-end', Lang.bind(this, this._onDragEnd));
this._windowSwitchTimeoutId = 0;
this._windowSwitchTimestamp = 0;
this._lastActiveWorkspaceIndex = -1;
this._lastHoveredWindow = null;
this._needsFakePointerEvent = false;
this.workspaces = null;
},
// The members we construct that are implemented in JS might
// want to access the overview as Main.overview to connect
// signal handlers and so forth. So we create them after
// construction in this init() method.
init: function() {
this.shellInfo = new ShellInfo();
this.viewSelector = new ViewSelector.ViewSelector();
this._group.add_actor(this.viewSelector.actor);
this._workspacesDisplay = new WorkspacesView.WorkspacesDisplay();
this.viewSelector.addViewTab('windows', _("Windows"), this._workspacesDisplay.actor, 'text-x-generic');
let appView = new AppDisplay.AllAppDisplay();
this.viewSelector.addViewTab('applications', _("Applications"), appView.actor, 'system-run');
// Default search providers
this.viewSelector.addSearchProvider(new AppDisplay.AppSearchProvider());
this.viewSelector.addSearchProvider(new AppDisplay.PrefsSearchProvider());
this.viewSelector.addSearchProvider(new PlaceDisplay.PlaceSearchProvider());
this.viewSelector.addSearchProvider(new DocDisplay.DocSearchProvider());
// TODO - recalculate everything when desktop size changes
this.dash = new Dash.Dash();
this._group.add_actor(this.dash.actor);
this.dash.actor.add_constraint(this.viewSelector.constrainY);
this.dash.actor.add_constraint(this.viewSelector.constrainHeight);
// Translators: this is the name of the dock/favorites area on
// the left of the overview
Main.ctrlAltTabManager.addGroup(this.dash.actor, _("Dash"), 'user-bookmarks');
},
_onDragBegin: function() {
DND.addDragMonitor(this._dragMonitor);
// Remember the workspace we started from
this._lastActiveWorkspaceIndex = global.screen.get_active_workspace_index();
},
_onDragEnd: function(time) {
// In case the drag was canceled while in the overview
// we have to go back to where we started and hide
// the overview
if (this._shownTemporarily) {
global.screen.get_workspace_by_index(this._lastActiveWorkspaceIndex).activate(time);
this.hideTemporarily();
}
this._resetWindowSwitchTimeout();
this._lastHoveredWindow = null;
DND.removeMonitor(this._dragMonitor);
this.endItemDrag();
},
_resetWindowSwitchTimeout: function() {
if (this._windowSwitchTimeoutId != 0) {
Mainloop.source_remove(this._windowSwitchTimeoutId);
this._windowSwitchTimeoutId = 0;
this._needsFakePointerEvent = false;
}
},
_fakePointerEvent: function() {
let display = Gdk.Display.get_default();
let deviceManager = display.get_device_manager();
let pointer = deviceManager.get_client_pointer();
let [screen, pointerX, pointerY] = pointer.get_position();
pointer.warp(screen, pointerX, pointerY);
},
_onDragMotion: function(dragEvent) {
let targetIsWindow = dragEvent.targetActor &&
dragEvent.targetActor._delegate &&
dragEvent.targetActor._delegate.metaWindow;
this._windowSwitchTimestamp = global.get_current_time();
if (targetIsWindow &&
dragEvent.targetActor._delegate.metaWindow == this._lastHoveredWindow)
return DND.DragMotionResult.CONTINUE;
this._lastHoveredWindow = null;
this._resetWindowSwitchTimeout();
if (targetIsWindow) {
this._lastHoveredWindow = dragEvent.targetActor._delegate.metaWindow;
this._windowSwitchTimeoutId = Mainloop.timeout_add(DND_WINDOW_SWITCH_TIMEOUT,
Lang.bind(this, function() {
this._needsFakePointerEvent = true;
Main.activateWindow(dragEvent.targetActor._delegate.metaWindow,
this._windowSwitchTimestamp);
this.hideTemporarily();
this._lastHoveredWindow = null;
}));
}
return DND.DragMotionResult.CONTINUE;
},
setScrollAdjustment: function(adjustment, direction) {
this._scrollAdjustment = adjustment;
if (this._scrollAdjustment == null)
this._scrollDirection = SwipeScrollDirection.NONE;
else
this._scrollDirection = direction;
},
_onButtonPress: function(actor, event) {
if (this._scrollDirection == SwipeScrollDirection.NONE)
return;
let [stageX, stageY] = event.get_coords();
this._dragStartX = this._dragX = stageX;
this._dragStartY = this._dragY = stageY;
this._dragStartValue = this._scrollAdjustment.value;
this._lastMotionTime = -1; // used to track "stopping" while swipe-scrolling
this._capturedEventId = global.stage.connect('captured-event',
Lang.bind(this, this._onCapturedEvent));
this.emit('swipe-scroll-begin');
},
_onCapturedEvent: function(actor, event) {
let stageX, stageY;
let threshold = Gtk.Settings.get_default().gtk_dnd_drag_threshold;
switch(event.type()) {
case Clutter.EventType.BUTTON_RELEASE:
[stageX, stageY] = event.get_coords();
// default to snapping back to the original value
let newValue = this._dragStartValue;
let minValue = this._scrollAdjustment.lower;
let maxValue = this._scrollAdjustment.upper - this._scrollAdjustment.page_size;
let direction;
if (this._scrollDirection == SwipeScrollDirection.HORIZONTAL) {
direction = stageX > this._dragStartX ? -1 : 1;
if (St.Widget.get_default_direction() == St.TextDirection.RTL)
direction *= -1;
} else {
direction = stageY > this._dragStartY ? -1 : 1;
}
// We default to scroll a full page size; both the first
// and the last page may be smaller though, so we need to
// adjust difference in those cases.
let difference = direction * this._scrollAdjustment.page_size;
if (this._dragStartValue + difference > maxValue)
difference = maxValue - this._dragStartValue;
else if (this._dragStartValue + difference < minValue)
difference = minValue - this._dragStartValue;
// If the user has moved more than half the scroll
// difference, we want to "settle" to the new value
// even if the user stops dragging rather "throws" by
// releasing during the drag.
let distance = this._dragStartValue - this._scrollAdjustment.value;
let noStop = Math.abs(distance / difference) > 0.5;
// We detect if the user is stopped by comparing the
// timestamp of the button release with the timestamp of
// the last motion. Experimentally, a difference of 0 or 1
// millisecond indicates that the mouse is in motion, a
// larger difference indicates that the mouse is stopped.
if ((this._lastMotionTime > 0 &&
this._lastMotionTime > event.get_time() - 2) ||
noStop) {
if (this._dragStartValue + difference >= minValue &&
this._dragStartValue + difference <= maxValue)
newValue += difference;
}
let result;
// See if the user has moved the mouse enough to trigger
// a drag
if (Math.abs(stageX - this._dragStartX) < threshold &&
Math.abs(stageY - this._dragStartY) < threshold) {
// no motion? It's a click!
result = SwipeScrollResult.CLICK;
this.emit('swipe-scroll-end', result);
} else {
if (newValue == this._dragStartValue)
result = SwipeScrollResult.CANCEL;
else
result = SwipeScrollResult.SWIPE;
// The event capture handler is disconnected
// while scrolling to the final position, so
// to avoid undesired prelights we raise
// the cover pane.
this._coverPane.raise_top();
this._coverPane.show();
Tweener.addTween(this._scrollAdjustment,
{ value: newValue,
time: ANIMATION_TIME,
transition: 'easeOutQuad',
onCompleteScope: this,
onComplete: function() {
this._coverPane.hide();
this.emit('swipe-scroll-end',
result);
}
});
}
global.stage.disconnect(this._capturedEventId);
this._capturedEventId = 0;
return result != SwipeScrollResult.CLICK;
case Clutter.EventType.MOTION:
[stageX, stageY] = event.get_coords();
let dx = this._dragX - stageX;
let dy = this._dragY - stageY;
let primary = global.get_primary_monitor();
this._dragX = stageX;
this._dragY = stageY;
this._lastMotionTime = event.get_time();
// See if the user has moved the mouse enough to trigger
// a drag
if (Math.abs(stageX - this._dragStartX) < threshold &&
Math.abs(stageY - this._dragStartY) < threshold)
return true;
if (this._scrollDirection == SwipeScrollDirection.HORIZONTAL) {
if (St.Widget.get_default_direction() == St.TextDirection.RTL)
this._scrollAdjustment.value -= (dx / primary.width) * this._scrollAdjustment.page_size;
else
this._scrollAdjustment.value += (dx / primary.width) * this._scrollAdjustment.page_size;
} else {
this._scrollAdjustment.value += (dy / primary.height) * this._scrollAdjustment.page_size;
}
return true;
// Block enter/leave events to avoid prelights
// during swipe-scroll
case Clutter.EventType.ENTER:
case Clutter.EventType.LEAVE:
return true;
}
return false;
},
_getDesktopClone: function() {
let windows = global.get_window_actors().filter(function(w) {
return w.meta_window.get_window_type() == Meta.WindowType.DESKTOP;
});
if (windows.length == 0)
return null;
let clone = new Clutter.Clone({ source: windows[0].get_texture() });
clone.source.connect('destroy', Lang.bind(this, function() {
clone.destroy();
}));
return clone;
},
relayout: function () {
let primary = global.get_primary_monitor();
let rtl = (St.Widget.get_default_direction () == St.TextDirection.RTL);
let contentY = Main.panel.actor.height;
let contentHeight = primary.height - contentY - Main.messageTray.actor.height;
this._group.set_position(primary.x, primary.y);
this._group.set_size(primary.width, primary.height);
this._coverPane.set_position(0, contentY);
this._coverPane.set_size(primary.width, contentHeight);
let dashWidth = Math.round(DASH_SPLIT_FRACTION * primary.width);
let viewWidth = primary.width - dashWidth - this._spacing;
let viewHeight = contentHeight - 2 * this._spacing;
let viewY = contentY + this._spacing;
let viewX = rtl ? 0 : dashWidth + this._spacing;
// Set the dash's x position - y is handled by a constraint
let dashX;
if (rtl) {
this.dash.actor.set_anchor_point_from_gravity(Clutter.Gravity.NORTH_EAST);
dashX = primary.width;
} else {
dashX = 0;
}
this.dash.actor.set_x(dashX);
this.viewSelector.actor.set_position(viewX, viewY);
this.viewSelector.actor.set_size(viewWidth, viewHeight);
},
//// Public methods ////
beginItemDrag: function(source) {
this.emit('item-drag-begin');
},
cancelledItemDrag: function(source) {
this.emit('item-drag-cancelled');
},
endItemDrag: function(source) {
this.emit('item-drag-end');
},
beginWindowDrag: function(source) {
this.emit('window-drag-begin');
},
cancelledWindowDrag: function(source) {
this.emit('window-drag-cancelled');
},
endWindowDrag: function(source) {
this.emit('window-drag-end');
},
// show:
//
// Animates the overview visible and grabs mouse and keyboard input
show : function() {
if (this._shown)
return;
// Do this manually instead of using _syncInputMode, to handle failure
if (!Main.pushModal(this._group))
return;
this._modal = true;
this._animateVisible();
this._shown = true;
this._buttonPressId = this._group.connect('button-press-event',
Lang.bind(this, this._onButtonPress));
},
_animateVisible: function() {
if (this.visible || this.animationInProgress)
return;
this.visible = true;
this.animationInProgress = true;
// All the the actors in the window group are completely obscured,
// hiding the group holding them while the Overview is displayed greatly
// increases performance of the Overview especially when there are many
// windows visible.
//
// If we switched to displaying the actors in the Overview rather than
// clones of them, this would obviously no longer be necessary.
global.window_group.hide();
this._group.show();
this._background.show();
this._workspacesDisplay.show();
this.workspaces = this._workspacesDisplay.workspacesView;
global.overlay_group.add_actor(this.workspaces.actor);
if (!this._desktopFade.child)
this._desktopFade.child = this._getDesktopClone();
if (!this.workspaces.getActiveWorkspace().hasMaximizedWindows()) {
this._desktopFade.opacity = 255;
this._desktopFade.show();
Tweener.addTween(this._desktopFade,
{ opacity: 0,
time: ANIMATION_TIME,
transition: 'easeOutQuad'
});
}
this._group.opacity = 0;
Tweener.addTween(this._group,
{ opacity: 255,
transition: 'easeOutQuad',
time: ANIMATION_TIME,
onComplete: this._showDone,
onCompleteScope: this
});
this._coverPane.raise_top();
this._coverPane.show();
this.emit('showing');
},
// showTemporarily:
//
// Animates the overview visible without grabbing mouse and keyboard input;
// if show() has already been called, this has no immediate effect, but
// will result in the overview not being hidden until hideTemporarily() is
// called.
showTemporarily: function() {
if (this._shownTemporarily)
return;
this._syncInputMode();
this._animateVisible();
this._shownTemporarily = true;
},
// hide:
//
// Reverses the effect of show()
hide: function() {
if (!this._shown)
return;
if (!this._shownTemporarily)
this._animateNotVisible();
this._shown = false;
this._syncInputMode();
if (this._buttonPressId > 0)
this._group.disconnect(this._buttonPressId);
this._buttonPressId = 0;
},
// hideTemporarily:
//
// Reverses the effect of showTemporarily()
hideTemporarily: function() {
if (!this._shownTemporarily)
return;
if (!this._shown)
this._animateNotVisible();
this._shownTemporarily = false;
this._syncInputMode();
},
toggle: function() {
if (this._shown)
this.hide();
else
this.show();
},
//// Private methods ////
_syncInputMode: function() {
// We delay input mode changes during animation so that when removing the
// overview we don't have a problem with the release of a press/release
// going to an application.
if (this.animationInProgress)
return;
if (this._shown) {
if (!this._modal) {
if (Main.pushModal(this._group))
this._modal = true;
else
this.hide();
}
} else if (this._shownTemporarily) {
if (this._modal) {
Main.popModal(this._group);
this._modal = false;
}
global.stage_input_mode = Shell.StageInputMode.FULLSCREEN;
} else {
if (this._modal) {
Main.popModal(this._group);
this._modal = false;
}
else if (global.stage_input_mode == Shell.StageInputMode.FULLSCREEN)
global.stage_input_mode = Shell.StageInputMode.NORMAL;
}
},
_animateNotVisible: function() {
if (!this.visible || this.animationInProgress)
return;
this.animationInProgress = true;
this._hideInProgress = true;
if (!this.workspaces.getActiveWorkspace().hasMaximizedWindows()) {
this._desktopFade.opacity = 0;
this._desktopFade.show();
Tweener.addTween(this._desktopFade,
{ opacity: 255,
time: ANIMATION_TIME,
transition: 'easeOutQuad' });
}
this.workspaces.hide();
// Make other elements fade out.
Tweener.addTween(this._group,
{ opacity: 0,
transition: 'easeOutQuad',
time: ANIMATION_TIME,
onComplete: this._hideDone,
onCompleteScope: this
});
this._coverPane.raise_top();
this._coverPane.show();
this.emit('hiding');
},
_showDone: function() {
this.animationInProgress = false;
this._desktopFade.hide();
this._coverPane.hide();
this.emit('shown');
// Handle any calls to hide* while we were showing
if (!this._shown && !this._shownTemporarily)
this._animateNotVisible();
this._syncInputMode();
},
_hideDone: function() {
global.window_group.show();
this.workspaces.destroy();
this.workspaces = null;
this._workspacesDisplay.hide();
this._desktopFade.hide();
this._background.hide();
this._group.hide();
this.visible = false;
this.animationInProgress = false;
this._hideInProgress = false;
this._coverPane.hide();
this.emit('hidden');
// Handle any calls to show* while we were hiding
if (this._shown || this._shownTemporarily)
this._animateVisible();
this._syncInputMode();
// Fake a pointer event if requested
if (this._needsFakePointerEvent) {
this._fakePointerEvent();
this._needsFakePointerEvent = false;
}
}
};
Signals.addSignalMethods(Overview.prototype);