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// Copyright 2017 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "ui/accessibility/platform/ax_system_caret_win.h"
#include <windows.h>
#include "base/check.h"
#include "base/notreached.h"
#include "ui/accessibility/ax_enums.mojom.h"
#include "ui/accessibility/platform/ax_platform_node_win.h"
#include "ui/display/win/screen_win.h"
#include "ui/gfx/geometry/rect_conversions.h"
#include "ui/gfx/geometry/rect_f.h"
namespace ui {
AXSystemCaretWin::AXSystemCaretWin(gfx::AcceleratedWidget event_target)
: event_target_(event_target), caret_(AXPlatformNode::Create(*this)) {
// The caret object is not part of the accessibility tree and so doesn't need
// a node ID. A globally unique ID is used when firing Win events, retrieved
// via |unique_id|.
data_.id = -1;
data_.role = ax::mojom::Role::kCaret;
// |get_accState| should return 0 which means that the caret is visible.
data_.state = 0;
data_.AddState(ax::mojom::State::kInvisible);
// According to MSDN, "Edit" should be the name of the caret object.
data_.SetName(u"Edit");
data_.relative_bounds.offset_container_id = -1;
if (event_target_) {
::NotifyWinEvent(EVENT_OBJECT_CREATE, event_target_, OBJID_CARET,
-caret_->GetUniqueId());
}
}
AXSystemCaretWin::~AXSystemCaretWin() {
if (event_target_) {
::NotifyWinEvent(EVENT_OBJECT_DESTROY, event_target_, OBJID_CARET,
-caret_->GetUniqueId());
}
}
Microsoft::WRL::ComPtr<IAccessible> AXSystemCaretWin::GetCaret() const {
Microsoft::WRL::ComPtr<IAccessible> caret_accessible;
HRESULT hr = static_cast<AXPlatformNodeWin&>(*caret_).QueryInterface(
IID_PPV_ARGS(&caret_accessible));
DCHECK(SUCCEEDED(hr));
return caret_accessible;
}
void AXSystemCaretWin::MoveCaretTo(const gfx::Rect& bounds_physical_pixels) {
if (bounds_physical_pixels.IsEmpty())
return;
// If the caret has non-empty bounds, assume it has been made visible.
bool newly_visible = false;
if (data_.HasState(ax::mojom::State::kInvisible)) {
newly_visible = true;
data_.RemoveState(ax::mojom::State::kInvisible);
}
if (!event_target_)
return;
if (newly_visible) {
::NotifyWinEvent(EVENT_OBJECT_SHOW, event_target_, OBJID_CARET,
-caret_->GetUniqueId());
}
gfx::RectF new_location(bounds_physical_pixels);
// Avoid redundant caret move events (if the location stays the same), but
// always fire when it's made visible again.
if (data_.relative_bounds.bounds != new_location || newly_visible) {
data_.relative_bounds.bounds = new_location;
::NotifyWinEvent(EVENT_OBJECT_LOCATIONCHANGE, event_target_, OBJID_CARET,
-caret_->GetUniqueId());
}
}
void AXSystemCaretWin::Hide() {
if (!data_.HasState(ax::mojom::State::kInvisible)) {
data_.AddState(ax::mojom::State::kInvisible);
data_.relative_bounds.bounds.set_width(0);
if (event_target_) {
::NotifyWinEvent(EVENT_OBJECT_HIDE, event_target_, OBJID_CARET,
-caret_->GetUniqueId());
}
}
}
const AXNodeData& AXSystemCaretWin::GetData() const {
return data_;
}
gfx::NativeViewAccessible AXSystemCaretWin::GetParent() const {
if (!event_target_)
return nullptr;
gfx::NativeViewAccessible parent;
HRESULT hr =
::AccessibleObjectFromWindow(event_target_, OBJID_WINDOW, IID_IAccessible,
reinterpret_cast<void**>(&parent));
if (SUCCEEDED(hr))
return parent;
return nullptr;
}
gfx::Rect AXSystemCaretWin::GetBoundsRect(
const AXCoordinateSystem coordinate_system,
const AXClippingBehavior clipping_behavior,
AXOffscreenResult* offscreen_result) const {
switch (coordinate_system) {
case AXCoordinateSystem::kScreenPhysicalPixels:
// We could optionally add clipping here if ever needed.
return ToEnclosingRect(data_.relative_bounds.bounds);
case AXCoordinateSystem::kScreenDIPs:
return display::win::GetScreenWin()->ScreenToDIPRect(
event_target_, ToEnclosingRect(data_.relative_bounds.bounds));
case AXCoordinateSystem::kRootFrame:
case AXCoordinateSystem::kFrame:
NOTIMPLEMENTED();
return gfx::Rect();
}
}
gfx::AcceleratedWidget
AXSystemCaretWin::GetTargetForNativeAccessibilityEvent() {
return event_target_;
}
bool AXSystemCaretWin::ShouldIgnoreHoveredStateForTesting() {
return false;
}
AXPlatformNodeId AXSystemCaretWin::GetUniqueId() const {
return unique_id_;
}
} // namespace ui
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