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// Copyright (c) 2012 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.
#include <stddef.h>
#include <set>
#include <string>
#include <tuple>
#include "base/compiler_specific.h"
#include "base/macros.h"
#include "base/memory/ref_counted.h"
#include "base/timer/timer.h"
#include "build/build_config.h"
#include "ui/app_list/app_list_export.h"
#include "ui/app_list/app_list_model.h"
#include "ui/app_list/app_list_model_observer.h"
#include "ui/app_list/pagination_model.h"
#include "ui/app_list/pagination_model_observer.h"
#include "ui/base/models/list_model_observer.h"
#include "ui/compositor/layer_animation_observer.h"
#include "ui/gfx/image/image_skia_operations.h"
#include "ui/views/animation/bounds_animator.h"
#include "ui/views/controls/button/button.h"
#include "ui/views/controls/image_view.h"
#include "ui/views/view.h"
#include "ui/views/view_model.h"
namespace views {
class ButtonListener;
namespace app_list {
namespace test {
class AppsGridViewTestApi;
class ApplicationDragAndDropHost;
class AppListItemView;
class AppsGridViewDelegate;
class AppsGridViewFolderDelegate;
class PageSwitcher;
class PaginationController;
class PulsingBlockView;
// AppsGridView displays a grid for AppListItemList sub model.
class APP_LIST_EXPORT AppsGridView : public views::View,
public views::ButtonListener,
public AppListItemListObserver,
public PaginationModelObserver,
public AppListModelObserver,
public ui::ImplicitAnimationObserver {
enum Pointer {
// Constructs the app icon grid view. |delegate| is the delegate of this
// view, which usually is the hosting AppListView.
explicit AppsGridView(AppsGridViewDelegate* delegate);
~AppsGridView() override;
// Sets fixed layout parameters. After setting this, CalculateLayout below
// is no longer called to dynamically choosing those layout params.
void SetLayout(int cols, int rows_per_page);
int cols() const { return cols_; }
int rows_per_page() const { return rows_per_page_; }
// Returns the size of a tile view including its padding.
static gfx::Size GetTotalTileSize();
// This resets the grid view to a fresh state for showing the app list.
void ResetForShowApps();
// Sets |model| to use. Note this does not take ownership of |model|.
void SetModel(AppListModel* model);
// Sets the |item_list| to render. Note this does not take ownership of
// |item_list|.
void SetItemList(AppListItemList* item_list);
void SetSelectedView(AppListItemView* view);
void ClearSelectedView(AppListItemView* view);
void ClearAnySelectedView();
bool IsSelectedView(const AppListItemView* view) const;
bool has_selected_view() const { return selected_view_ != nullptr; }
void InitiateDrag(AppListItemView* view,
Pointer pointer,
const ui::LocatedEvent& event);
// Called from AppListItemView when it receives a drag event. Returns true
// if the drag is still happening.
bool UpdateDragFromItem(Pointer pointer, const ui::LocatedEvent& event);
// Called when the user is dragging an app. |point| is in grid view
// coordinates.
void UpdateDrag(Pointer pointer, const gfx::Point& point);
void EndDrag(bool cancel);
bool IsDraggedView(const AppListItemView* view) const;
void ClearDragState();
void SetDragViewVisible(bool visible);
// Set the drag and drop host for application links.
void SetDragAndDropHostOfCurrentAppList(
ApplicationDragAndDropHost* drag_and_drop_host);
// Return true if the |bounds_animator_| is animating |view|.
bool IsAnimatingView(AppListItemView* view);
bool has_dragged_view() const { return drag_view_ != nullptr; }
bool dragging() const { return drag_pointer_ != NONE; }
// Gets the PaginationModel used for the grid view.
PaginationModel* pagination_model() { return &pagination_model_; }
// Overridden from views::View:
gfx::Size GetPreferredSize() const override;
void Layout() override;
bool OnKeyPressed(const ui::KeyEvent& event) override;
bool OnKeyReleased(const ui::KeyEvent& event) override;
bool OnMouseWheel(const ui::MouseWheelEvent& event) override;
void ViewHierarchyChanged(
const ViewHierarchyChangedDetails& details) override;
bool GetDropFormats(
int* formats,
std::set<ui::Clipboard::FormatType>* format_types) override;
bool CanDrop(const OSExchangeData& data) override;
int OnDragUpdated(const ui::DropTargetEvent& event) override;
// Overridden from ui::EventHandler:
void OnGestureEvent(ui::GestureEvent* event) override;
void OnScrollEvent(ui::ScrollEvent* event) override;
// Stops the timer that triggers a page flip during a drag.
void StopPageFlipTimer();
// Returns the item view of the item at |index|.
AppListItemView* GetItemViewAt(int index) const;
// Show or hide the top item views.
void SetTopItemViewsVisible(bool visible);
// Schedules an animation to show or hide the view.
void ScheduleShowHideAnimation(bool show);
// Called to initiate drag for reparenting a folder item in root level grid
// view.
// Both |drag_view_rect| and |drag_pint| is in the coordinates of root level
// grid view.
void InitiateDragFromReparentItemInRootLevelGridView(
AppListItemView* original_drag_view,
const gfx::Rect& drag_view_rect,
const gfx::Point& drag_point,
bool has_native_drag);
// Updates drag in the root level grid view when receiving the drag event
// dispatched from the hidden grid view for reparenting a folder item.
void UpdateDragFromReparentItem(Pointer pointer,
const gfx::Point& drag_point);
// Dispatches the drag event from hidden grid view to the top level grid view.
void DispatchDragEventForReparent(Pointer pointer,
const gfx::Point& drag_point);
// Handles EndDrag event dispatched from the hidden folder grid view in the
// root level grid view to end reparenting a folder item.
// |events_forwarded_to_drag_drop_host|: True if the dragged item is dropped
// to the drag_drop_host, eg. dropped on shelf.
// |cancel_drag|: True if the drag is ending because it has been canceled.
void EndDragFromReparentItemInRootLevel(
bool events_forwarded_to_drag_drop_host,
bool cancel_drag);
// Handles EndDrag event in the hidden folder grid view to end reparenting
// a folder item.
void EndDragForReparentInHiddenFolderGridView();
// Called when the folder item associated with the grid view is removed.
// The grid view must be inside a folder view.
void OnFolderItemRemoved();
// Return the view model for test purposes.
const views::ViewModelT<AppListItemView>* view_model_for_test() const {
return &view_model_;
// For test: Return if the drag and drop handler was set.
bool has_drag_and_drop_host_for_test() {
return nullptr != drag_and_drop_host_;
// For test: Return if the drag and drop operation gets dispatched.
bool forward_events_to_drag_and_drop_host_for_test() {
return forward_events_to_drag_and_drop_host_;
void set_folder_delegate(AppsGridViewFolderDelegate* folder_delegate) {
folder_delegate_ = folder_delegate;
AppListItemView* activated_folder_item_view() const {
return activated_folder_item_view_;
const AppListModel* model() const { return model_; }
friend class test::AppsGridViewTestApi;
enum DropAttempt {
// Represents the index to an item view in the grid.
struct Index {
Index() : page(-1), slot(-1) {}
Index(int page, int slot) : page(page), slot(slot) {}
bool operator==(const Index& other) const {
return page == && slot == other.slot;
bool operator!=(const Index& other) const {
return page != || slot != other.slot;
bool operator<(const Index& other) const {
return std::tie(page, slot) < std::tie(, other.slot);
int page; // Which page an item view is on.
int slot; // Which slot in the page an item view is in.
int tiles_per_page() const { return cols_ * rows_per_page_; }
// Updates from model.
void Update();
// Updates page splits for item views.
void UpdatePaging();
// Updates the number of pulsing block views based on AppListModel status and
// number of apps.
void UpdatePulsingBlockViews();
AppListItemView* CreateViewForItemAtIndex(size_t index);
// Convert between the model index and the visual index. The model index
// is the index of the item in AppListModel. The visual index is the Index
// struct above with page/slot info of where to display the item.
Index GetIndexFromModelIndex(int model_index) const;
int GetModelIndexFromIndex(const Index& index) const;
// Ensures the view is visible. Note that if there is a running page
// transition, this does nothing.
void EnsureViewVisible(const Index& index);
void SetSelectedItemByIndex(const Index& index);
bool IsValidIndex(const Index& index) const;
Index GetIndexOfView(const AppListItemView* view) const;
AppListItemView* GetViewAtIndex(const Index& index) const;
// Gets the index of the AppListItemView at the end of the view model.
Index GetLastViewIndex() const;
void MoveSelected(int page_delta, int slot_x_delta, int slot_y_delta);
void CalculateIdealBounds();
void AnimateToIdealBounds();
// Invoked when the given |view|'s current bounds and target bounds are on
// different rows. To avoid moving diagonally, |view| would be put into a
// slot prior |target| and fade in while moving to |target|. In the meanwhile,
// a layer copy of |view| would start at |current| and fade out while moving
// to succeeding slot of |current|. |animate_current| controls whether to run
// fading out animation from |current|. |animate_target| controls whether to
// run fading in animation to |target|.
void AnimationBetweenRows(AppListItemView* view,
bool animate_current,
const gfx::Rect& current,
bool animate_target,
const gfx::Rect& target);
// Extracts drag location info from |event| into |drag_point|.
void ExtractDragLocation(const ui::LocatedEvent& event,
gfx::Point* drag_point);
// Updates |reorder_drop_target_|, |folder_drop_target_| and |drop_attempt_|
// based on |drag_view_|'s position.
void CalculateDropTarget();
// If |point| is a valid folder drop target, returns true and sets
// |drop_target| to the index of the view to do a folder drop for.
bool CalculateFolderDropTarget(const gfx::Point& point,
Index* drop_target) const;
// Calculates the reorder target |point| and sets |drop_target| to the index
// of the view to reorder.
void CalculateReorderDropTarget(const gfx::Point& point,
Index* drop_target) const;
// Prepares |drag_and_drop_host_| for dragging. |grid_location| contains
// the drag point in this grid view's coordinates.
void StartDragAndDropHostDrag(const gfx::Point& grid_location);
// Dispatch the drag and drop update event to the dnd host (if needed).
void DispatchDragEventToDragAndDropHost(
const gfx::Point& location_in_screen_coordinates);
// Starts the page flip timer if |drag_point| is in left/right side page flip
// zone or is over page switcher.
void MaybeStartPageFlipTimer(const gfx::Point& drag_point);
// Invoked when |page_flip_timer_| fires.
void OnPageFlipTimer();
// Updates |model_| to move item represented by |item_view| to |target| slot.
void MoveItemInModel(AppListItemView* item_view, const Index& target);
// Updates |model_| to move item represented by |item_view| into a folder
// containing item located at |target| slot, also update |view_model_| for
// the related view changes.
void MoveItemToFolder(AppListItemView* item_view, const Index& target);
// Updates both data model and view_model_ for re-parenting a folder item to a
// new position in top level item list.
void ReparentItemForReorder(AppListItemView* item_view, const Index& target);
// Updates both data model and view_model_ for re-parenting a folder item
// to anther folder target. Returns whether the reparent succeeded.
bool ReparentItemToAnotherFolder(AppListItemView* item_view,
const Index& target);
// If there is only 1 item left in the source folder after reparenting an item
// from it, updates both data model and view_model_ for removing last item
// from the source folder and removes the source folder.
void RemoveLastItemFromReparentItemFolderIfNecessary(
const std::string& source_folder_id);
// If user does not drop the re-parenting folder item to any valid target,
// cancel the re-parenting action, let the item go back to its original
// parent folder with UI animation.
void CancelFolderItemReparent(AppListItemView* drag_item_view);
// Cancels any context menus showing for app items on the current page.
void CancelContextMenusOnCurrentPage();
// Removes the AppListItemView at |index| in |view_model_| and deletes it.
void DeleteItemViewAtIndex(int index);
// Returns true if |point| lies within the bounds of this grid view plus a
// buffer area surrounding it.
bool IsPointWithinDragBuffer(const gfx::Point& point) const;
// Overridden from views::ButtonListener:
void ButtonPressed(views::Button* sender, const ui::Event& event) override;
// Overridden from AppListItemListObserver:
void OnListItemAdded(size_t index, AppListItem* item) override;
void OnListItemRemoved(size_t index, AppListItem* item) override;
void OnListItemMoved(size_t from_index,
size_t to_index,
AppListItem* item) override;
void OnAppListItemHighlight(size_t index, bool highlight) override;
// Overridden from PaginationModelObserver:
void TotalPagesChanged() override;
void SelectedPageChanged(int old_selected, int new_selected) override;
void TransitionStarted() override;
void TransitionChanged() override;
// Overridden from AppListModelObserver:
void OnAppListModelStatusChanged() override;
// ui::ImplicitAnimationObserver overrides:
void OnImplicitAnimationsCompleted() override;
// Hide a given view temporarily without losing (mouse) events and / or
// changing the size of it. If |immediate| is set the change will be
// immediately applied - otherwise it will change gradually.
// If |hide| is set the view will get hidden, otherwise it gets shown.
void SetViewHidden(AppListItemView* view, bool hide, bool immediate);
// Whether the folder drag-and-drop UI should be enabled.
bool EnableFolderDragDropUI();
// Returns the size of the entire tile grid.
gfx::Size GetTileGridSize() const;
// Returns the slot number which the given |point| falls into or the closest
// slot if |point| is outside the page's bounds.
Index GetNearestTileIndexForPoint(const gfx::Point& point) const;
// Gets the bounds of the tile located at |slot| on the current page.
gfx::Rect GetExpectedTileBounds(int slot) const;
// Gets the bounds of the tile located at |row| and |col| on the current page.
gfx::Rect GetExpectedTileBounds(int row, int col) const;
// Gets the item view currently displayed at |slot| on the current page. If
// there is no item displayed at |slot|, returns NULL. Note that this finds an
// item *displayed* at a slot, which may differ from the item's location in
// the model (as it may have been temporarily moved during a drag operation).
AppListItemView* GetViewDisplayedAtSlotOnCurrentPage(int slot) const;
// Sets state of the view with |target_index| to |is_target_folder| for
// dropping |drag_view_|.
void SetAsFolderDroppingTarget(const Index& target_index,
bool is_target_folder);
// Invoked when |reorder_timer_| fires to show re-order preview UI.
void OnReorderTimer();
// Invoked when |folder_item_reparent_timer_| fires.
void OnFolderItemReparentTimer();
// Invoked when |folder_dropping_timer_| fires to show folder dropping
// preview UI.
void OnFolderDroppingTimer();
// Updates drag state for dragging inside a folder's grid view.
void UpdateDragStateInsideFolder(Pointer pointer,
const gfx::Point& drag_point);
// Returns true if drag event is happening in the root level AppsGridView
// for reparenting a folder item.
bool IsDraggingForReparentInRootLevelGridView() const;
// Returns true if drag event is happening in the hidden AppsGridView of the
// folder during reparenting a folder item.
bool IsDraggingForReparentInHiddenGridView() const;
// Returns the target icon bounds for |drag_item_view| to fly back
// to its parent |folder_item_view| in animation.
gfx::Rect GetTargetIconRectInFolder(AppListItemView* drag_item_view,
AppListItemView* folder_item_view);
// Returns true if the grid view is under an OEM folder.
bool IsUnderOEMFolder();
AppListModel* model_; // Owned by AppListView.
AppListItemList* item_list_; // Not owned.
AppsGridViewDelegate* delegate_;
// This can be NULL. Only grid views inside folders have a folder delegate.
AppsGridViewFolderDelegate* folder_delegate_;
PaginationModel pagination_model_;
// Must appear after |pagination_model_|.
std::unique_ptr<PaginationController> pagination_controller_;
PageSwitcher* page_switcher_view_; // Owned by views hierarchy.
int cols_;
int rows_per_page_;
// List of app item views. There is a view per item in |model_|.
views::ViewModelT<AppListItemView> view_model_;
// List of pulsing block views.
views::ViewModelT<PulsingBlockView> pulsing_blocks_model_;
AppListItemView* selected_view_;
AppListItemView* drag_view_;
// The index of the drag_view_ when the drag starts.
Index drag_view_init_index_;
// The point where the drag started in AppListItemView coordinates.
gfx::Point drag_view_offset_;
// The point where the drag started in GridView coordinates.
gfx::Point drag_start_grid_view_;
// The location of |drag_view_| when the drag started.
gfx::Point drag_view_start_;
// Page the drag started on.
int drag_start_page_;
Pointer drag_pointer_;
// The most recent reorder drop target.
Index reorder_drop_target_;
// The most recent folder drop target.
Index folder_drop_target_;
// The index where an empty slot has been left as a placeholder for the
// reorder drop target. This updates when the reorder animation triggers.
Index reorder_placeholder_;
// The current action that ending a drag will perform.
DropAttempt drop_attempt_;
// Timer for re-ordering the |drop_target_| and |drag_view_|.
base::OneShotTimer reorder_timer_;
// Timer for dropping |drag_view_| into the folder containing
// the |drop_target_|.
base::OneShotTimer folder_dropping_timer_;
// Timer for dragging a folder item out of folder container ink bubble.
base::OneShotTimer folder_item_reparent_timer_;
// An application target drag and drop host which accepts dnd operations.
ApplicationDragAndDropHost* drag_and_drop_host_;
// The drag operation is currently inside the dnd host and events get
// forwarded.
bool forward_events_to_drag_and_drop_host_;
// Last mouse drag location in this view's coordinates.
gfx::Point last_drag_point_;
// Timer to auto flip page when dragging an item near the left/right edges.
base::OneShotTimer page_flip_timer_;
// Target page to switch to when |page_flip_timer_| fires.
int page_flip_target_;
// Delay in milliseconds of when |page_flip_timer_| should fire after user
// drags an item near the edges.
int page_flip_delay_in_ms_;
views::BoundsAnimator bounds_animator_;
// The most recent activated folder item view.
AppListItemView* activated_folder_item_view_;
// Tracks if drag_view_ is dragged out of the folder container bubble
// when dragging a item inside a folder.
bool drag_out_of_folder_container_;
// True if the drag_view_ item is a folder item being dragged for reparenting.
bool dragging_for_reparent_item_;
} // namespace app_list