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// Copyright 2012 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/base/win/hwnd_subclass.h"
#include <algorithm>
#include "base/check.h"
#include "base/containers/contains.h"
#include "base/memory/ptr_util.h"
#include "base/memory/raw_ptr.h"
#include "base/memory/singleton.h"
#include "ui/base/win/touch_input.h"
#include "ui/gfx/win/hwnd_util.h"
namespace {
const char kHWNDSubclassKey[] = "__UI_BASE_WIN_HWND_SUBCLASS_PROC__";
LRESULT CALLBACK WndProc(HWND hwnd,
UINT message,
WPARAM w_param,
LPARAM l_param) {
ui::HWNDSubclass* wrapped_wnd_proc =
reinterpret_cast<ui::HWNDSubclass*>(
ui::ViewProp::GetValue(hwnd, kHWNDSubclassKey));
return wrapped_wnd_proc ? wrapped_wnd_proc->OnWndProc(hwnd,
message,
w_param,
l_param)
: DefWindowProc(hwnd, message, w_param, l_param);
}
WNDPROC GetCurrentWndProc(HWND target) {
return reinterpret_cast<WNDPROC>(GetWindowLongPtr(target, GWLP_WNDPROC));
}
} // namespace
namespace ui {
// Singleton factory that creates and manages the lifetime of all
// ui::HWNDSubclass objects.
class HWNDSubclass::HWNDSubclassFactory {
public:
static HWNDSubclassFactory* GetInstance() {
return base::Singleton<
HWNDSubclassFactory,
base::LeakySingletonTraits<HWNDSubclassFactory>>::get();
}
HWNDSubclassFactory(const HWNDSubclassFactory&) = delete;
HWNDSubclassFactory& operator=(const HWNDSubclassFactory&) = delete;
// Returns a non-null HWNDSubclass corresponding to the HWND |target|. Creates
// one if none exists. Retains ownership of the returned pointer.
HWNDSubclass* GetHwndSubclassForTarget(HWND target) {
DCHECK(target);
HWNDSubclass* subclass = reinterpret_cast<HWNDSubclass*>(
ui::ViewProp::GetValue(target, kHWNDSubclassKey));
if (!subclass) {
subclass = new ui::HWNDSubclass(target);
hwnd_subclasses_.push_back(base::WrapUnique(subclass));
}
return subclass;
}
const std::vector<std::unique_ptr<HWNDSubclass>>& hwnd_subclasses() {
return hwnd_subclasses_;
}
private:
friend struct base::DefaultSingletonTraits<HWNDSubclassFactory>;
HWNDSubclassFactory() {}
std::vector<std::unique_ptr<HWNDSubclass>> hwnd_subclasses_;
};
// static
void HWNDSubclass::AddFilterToTarget(HWND target, HWNDMessageFilter* filter) {
HWNDSubclassFactory::GetInstance()->GetHwndSubclassForTarget(
target)->AddFilter(filter);
}
// static
void HWNDSubclass::RemoveFilterFromAllTargets(HWNDMessageFilter* filter) {
HWNDSubclassFactory* factory = HWNDSubclassFactory::GetInstance();
for (const auto& subclass : factory->hwnd_subclasses())
subclass->RemoveFilter(filter);
}
// static
HWNDSubclass* HWNDSubclass::GetHwndSubclassForTarget(HWND target) {
return HWNDSubclassFactory::GetInstance()->GetHwndSubclassForTarget(target);
}
void HWNDSubclass::AddFilter(HWNDMessageFilter* filter) {
DCHECK(filter);
if (!base::Contains(filters_, filter))
filters_.push_back(filter);
}
void HWNDSubclass::RemoveFilter(HWNDMessageFilter* filter) {
std::vector<raw_ptr<HWNDMessageFilter, VectorExperimental>>::iterator it =
std::ranges::find(filters_, filter);
if (it != filters_.end())
filters_.erase(it);
}
HWNDSubclass::HWNDSubclass(HWND target)
: target_(target),
original_wnd_proc_(GetCurrentWndProc(target)),
prop_(target, kHWNDSubclassKey, this) {
gfx::SetWindowProc(target_, &WndProc);
}
HWNDSubclass::~HWNDSubclass() {
}
LRESULT HWNDSubclass::OnWndProc(HWND hwnd,
UINT message,
WPARAM w_param,
LPARAM l_param) {
// Touch messages are always passed in screen coordinates. If the OS is
// scaled, but the app is not DPI aware, then then WM_TOUCH might be
// intended for a different window.
if (message == WM_TOUCH) {
TOUCHINPUT point;
if (ui::GetTouchInputInfoWrapper(reinterpret_cast<HTOUCHINPUT>(l_param), 1,
&point, sizeof(TOUCHINPUT))) {
POINT touch_location = {TOUCH_COORD_TO_PIXEL(point.x),
TOUCH_COORD_TO_PIXEL(point.y)};
HWND actual_target = WindowFromPoint(touch_location);
if (actual_target != hwnd) {
return SendMessage(actual_target, message, w_param, l_param);
}
}
}
for (std::vector<raw_ptr<HWNDMessageFilter, VectorExperimental>>::iterator
it = filters_.begin();
it != filters_.end(); ++it) {
LRESULT l_result = 0;
if ((*it)->FilterMessage(hwnd, message, w_param, l_param, &l_result))
return l_result;
}
// In most cases, |original_wnd_proc_| will take care of calling
// DefWindowProc.
return CallWindowProc(original_wnd_proc_, hwnd, message, w_param, l_param);
}
HWNDMessageFilter::~HWNDMessageFilter() {
HWNDSubclass::RemoveFilterFromAllTargets(this);
}
} // namespace ui
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