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// Copyright 2015 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 "components/exo/pointer.h"
#include "ash/shell.h"
#include "ash/shell_window_ids.h"
#include "components/exo/pointer_delegate.h"
#include "components/exo/surface.h"
#include "ui/aura/window.h"
#include "ui/events/event.h"
#include "ui/views/widget/widget.h"
namespace exo {
////////////////////////////////////////////////////////////////////////////////
// Pointer, public:
Pointer::Pointer(PointerDelegate* delegate)
: delegate_(delegate), surface_(nullptr), focus_(nullptr) {
ash::Shell::GetInstance()->AddPreTargetHandler(this);
}
Pointer::~Pointer() {
delegate_->OnPointerDestroying(this);
if (surface_)
surface_->RemoveSurfaceObserver(this);
if (focus_)
focus_->RemoveSurfaceObserver(this);
if (widget_)
widget_->CloseNow();
ash::Shell::GetInstance()->RemovePreTargetHandler(this);
}
void Pointer::SetCursor(Surface* surface, const gfx::Point& hotspot) {
// Early out if the pointer doesn't have a surface in focus.
if (!focus_)
return;
// If surface is different than the current pointer surface then remove the
// current surface and add the new surface.
if (surface != surface_) {
if (surface && surface->HasSurfaceDelegate()) {
DLOG(ERROR) << "Surface has already been assigned a role";
return;
}
if (surface_) {
widget_->GetNativeWindow()->RemoveChild(surface_);
surface_->Hide();
surface_->SetSurfaceDelegate(nullptr);
surface_->RemoveSurfaceObserver(this);
}
surface_ = surface;
if (surface_) {
surface_->SetSurfaceDelegate(this);
surface_->AddSurfaceObserver(this);
widget_->GetNativeWindow()->AddChild(surface_);
}
}
// Update hotspot and show cursor surface if not already visible.
hotspot_ = hotspot;
if (surface_) {
surface_->SetBounds(gfx::Rect(gfx::Point() - hotspot_.OffsetFromOrigin(),
surface_->layer()->size()));
if (!surface_->IsVisible())
surface_->Show();
}
}
////////////////////////////////////////////////////////////////////////////////
// ui::EventHandler overrides:
void Pointer::OnMouseEvent(ui::MouseEvent* event) {
Surface* target = GetEffectiveTargetForEvent(event);
// If target is different than the current pointer focus then we need to
// generate enter and leave events.
if (target != focus_) {
// First generate a leave event if we currently have a target in focus.
if (focus_) {
delegate_->OnPointerLeave(focus_);
focus_->RemoveSurfaceObserver(this);
focus_ = nullptr;
}
// Second generate an enter event if focus moved to a new target.
if (target) {
delegate_->OnPointerEnter(target, event->location(),
event->button_flags());
location_ = event->location();
focus_ = target;
focus_->AddSurfaceObserver(this);
}
}
switch (event->type()) {
case ui::ET_MOUSE_PRESSED:
case ui::ET_MOUSE_RELEASED:
if (focus_) {
delegate_->OnPointerButton(event->time_stamp(),
event->changed_button_flags(),
event->type() == ui::ET_MOUSE_PRESSED);
}
break;
case ui::ET_MOUSE_MOVED:
case ui::ET_MOUSE_DRAGGED:
// Generate motion event if location changed. We need to check location
// here as mouse movement can generate both "moved" and "entered" events
// but OnPointerMotion should only be called if location changed since
// OnPointerEnter was called.
if (focus_ && event->location() != location_) {
delegate_->OnPointerMotion(event->time_stamp(), event->location());
location_ = event->location();
}
break;
case ui::ET_SCROLL:
if (focus_) {
ui::ScrollEvent* scroll_event = static_cast<ui::ScrollEvent*>(event);
delegate_->OnPointerWheel(
event->time_stamp(),
gfx::Vector2d(scroll_event->x_offset(), scroll_event->y_offset()));
}
break;
case ui::ET_MOUSEWHEEL:
if (focus_) {
delegate_->OnPointerWheel(
event->time_stamp(),
static_cast<ui::MouseWheelEvent*>(event)->offset());
}
break;
case ui::ET_MOUSE_ENTERED:
case ui::ET_MOUSE_EXITED:
case ui::ET_MOUSE_CAPTURE_CHANGED:
case ui::ET_SCROLL_FLING_START:
case ui::ET_SCROLL_FLING_CANCEL:
break;
default:
NOTREACHED();
break;
}
// Update cursor widget to reflect current focus and pointer location.
if (focus_) {
if (!widget_)
CreatePointerWidget();
widget_->SetBounds(gfx::Rect(
focus_->GetBoundsInScreen().origin() + location_.OffsetFromOrigin(),
gfx::Size(1, 1)));
if (!widget_->IsVisible())
widget_->Show();
} else {
if (widget_ && widget_->IsVisible())
widget_->Hide();
}
}
void Pointer::OnScrollEvent(ui::ScrollEvent* event) {
OnMouseEvent(event);
}
////////////////////////////////////////////////////////////////////////////////
// SurfaceDelegate overrides:
void Pointer::OnSurfaceCommit() {
surface_->CommitSurfaceHierarchy();
surface_->SetBounds(gfx::Rect(gfx::Point() - hotspot_.OffsetFromOrigin(),
surface_->layer()->size()));
}
bool Pointer::IsSurfaceSynchronized() const {
// A pointer surface is always desynchronized.
return false;
}
////////////////////////////////////////////////////////////////////////////////
// SurfaceObserver overrides:
void Pointer::OnSurfaceDestroying(Surface* surface) {
DCHECK(surface == surface_ || surface == focus_);
if (surface == surface_)
surface_ = nullptr;
if (surface == focus_)
focus_ = nullptr;
surface->RemoveSurfaceObserver(this);
}
////////////////////////////////////////////////////////////////////////////////
// Pointer, private:
void Pointer::CreatePointerWidget() {
DCHECK(!widget_);
views::Widget::InitParams params;
params.type = views::Widget::InitParams::TYPE_TOOLTIP;
params.ownership = views::Widget::InitParams::WIDGET_OWNS_NATIVE_WIDGET;
params.shadow_type = views::Widget::InitParams::SHADOW_TYPE_NONE;
params.opacity = views::Widget::InitParams::TRANSLUCENT_WINDOW;
params.accept_events = false;
params.parent =
ash::Shell::GetContainer(ash::Shell::GetPrimaryRootWindow(),
ash::kShellWindowId_MouseCursorContainer);
widget_.reset(new views::Widget);
widget_->Init(params);
widget_->GetNativeWindow()->set_owned_by_parent(false);
widget_->GetNativeWindow()->SetName("ExoPointer");
}
Surface* Pointer::GetEffectiveTargetForEvent(ui::Event* event) const {
Surface* target =
Surface::AsSurface(static_cast<aura::Window*>(event->target()));
if (!target)
return nullptr;
return delegate_->CanAcceptPointerEventsForSurface(target) ? target : nullptr;
}
} // namespace exo
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