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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 "ui/base/win/hwnd_subclass.h"
#include <algorithm>
#include "base/logging.h"
#include "base/memory/scoped_vector.h"
#include "base/memory/singleton.h"
#include "ui/base/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 Singleton<HWNDSubclassFactory,
LeakySingletonTraits<HWNDSubclassFactory> >::get();
}
// 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(subclass);
}
return subclass;
}
const ScopedVector<HWNDSubclass>& hwnd_subclasses() {
return hwnd_subclasses_;
}
private:
friend struct DefaultSingletonTraits<HWNDSubclassFactory>;
HWNDSubclassFactory() {}
ScopedVector<HWNDSubclass> hwnd_subclasses_;
DISALLOW_COPY_AND_ASSIGN(HWNDSubclassFactory);
};
// static
void HWNDSubclass::AddFilterToTarget(HWND target, HWNDMessageFilter* filter) {
HWNDSubclassFactory::GetInstance()->GetHwndSubclassForTarget(
target)->AddFilter(filter);
}
// static
void HWNDSubclass::RemoveFilterFromAllTargets(HWNDMessageFilter* filter) {
HWNDSubclassFactory* factory = HWNDSubclassFactory::GetInstance();
ScopedVector<ui::HWNDSubclass>::const_iterator it;
for (it = factory->hwnd_subclasses().begin();
it != factory->hwnd_subclasses().end(); ++it)
(*it)->RemoveFilter(filter);
}
// static
HWNDSubclass* HWNDSubclass::GetHwndSubclassForTarget(HWND target) {
return HWNDSubclassFactory::GetInstance()->GetHwndSubclassForTarget(target);
}
void HWNDSubclass::AddFilter(HWNDMessageFilter* filter) {
DCHECK(filter);
if (std::find(filters_.begin(), filters_.end(), filter) == filters_.end())
filters_.push_back(filter);
}
void HWNDSubclass::RemoveFilter(HWNDMessageFilter* filter) {
std::vector<HWNDMessageFilter*>::iterator it =
std::find(filters_.begin(), filters_.end(), filter);
if (it != filters_.end())
filters_.erase(it);
}
HWNDSubclass::HWNDSubclass(HWND target)
: target_(target),
original_wnd_proc_(GetCurrentWndProc(target)),
ALLOW_THIS_IN_INITIALIZER_LIST(prop_(target, kHWNDSubclassKey, this)) {
ui::SetWindowProc(target_, &WndProc);
}
HWNDSubclass::~HWNDSubclass() {
}
LRESULT HWNDSubclass::OnWndProc(HWND hwnd,
UINT message,
WPARAM w_param,
LPARAM l_param) {
for (std::vector<HWNDMessageFilter*>::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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