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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 "testing/gtest/include/gtest/gtest.h"
#include "ui/gfx/win/window_impl.h"
namespace ui {
namespace {
class TestWindow : public gfx::WindowImpl {
public:
TestWindow() : saw_message(false) {}
TestWindow(const TestWindow&) = delete;
TestWindow& operator=(const TestWindow&) = delete;
~TestWindow() override {}
bool saw_message;
private:
// Overridden from gfx::WindowImpl:
BOOL ProcessWindowMessage(HWND window,
UINT message,
WPARAM w_param,
LPARAM l_param,
LRESULT& result,
DWORD msg_map_id) override {
if (message == WM_NCHITTEST)
saw_message = true;
return FALSE; // Results in DefWindowProc().
}
};
class TestMessageFilter : public HWNDMessageFilter {
public:
TestMessageFilter() : consume_messages(false), saw_message(false) {}
TestMessageFilter(const TestMessageFilter&) = delete;
TestMessageFilter& operator=(const TestMessageFilter&) = delete;
~TestMessageFilter() override {}
// Setting to true causes the filter subclass to stop messages from reaching
// the subclassed window procedure.
bool consume_messages;
// True if the message filter saw the message.
bool saw_message;
private:
// Overridden from HWNDMessageFilter:
bool FilterMessage(HWND hwnd,
UINT message,
WPARAM w_param,
LPARAM l_param,
LRESULT* l_result) override {
if (message == WM_NCHITTEST) {
saw_message = true;
return consume_messages;
}
return false;
}
};
} // namespace
TEST(HWNDSubclassTest, Filtering) {
TestWindow window;
window.Init(NULL, gfx::Rect(0, 0, 100, 100));
EXPECT_TRUE(window.hwnd() != NULL);
{
TestMessageFilter mf;
HWNDSubclass::AddFilterToTarget(window.hwnd(), &mf);
// We are not filtering, so both the filter and the window should receive
// this message:
::SendMessage(window.hwnd(), WM_NCHITTEST, 0, 0);
EXPECT_TRUE(mf.saw_message);
EXPECT_TRUE(window.saw_message);
mf.saw_message = false;
window.saw_message = false;
mf.consume_messages = true;
// We are now filtering, so only the filter should see this message:
::SendMessage(window.hwnd(), WM_NCHITTEST, 0, 0);
EXPECT_TRUE(mf.saw_message);
EXPECT_FALSE(window.saw_message);
}
}
TEST(HWNDSubclassTest, FilteringMultipleFilters) {
TestWindow window;
window.Init(NULL, gfx::Rect(0, 0, 100, 100));
EXPECT_TRUE(window.hwnd() != NULL);
{
TestMessageFilter mf1;
TestMessageFilter mf2;
HWNDSubclass::AddFilterToTarget(window.hwnd(), &mf1);
HWNDSubclass::AddFilterToTarget(window.hwnd(), &mf2);
// We are not filtering, so both the filter and the window should receive
// this message:
::SendMessage(window.hwnd(), WM_NCHITTEST, 0, 0);
EXPECT_TRUE(mf1.saw_message);
EXPECT_TRUE(mf2.saw_message);
EXPECT_TRUE(window.saw_message);
mf1.saw_message = false;
mf2.saw_message = false;
window.saw_message = false;
mf1.consume_messages = true;
// We are now filtering, so only the filter |mf1| should see this message:
::SendMessage(window.hwnd(), WM_NCHITTEST, 0, 0);
EXPECT_TRUE(mf1.saw_message);
EXPECT_FALSE(mf2.saw_message);
EXPECT_FALSE(window.saw_message);
}
}
TEST(HWNDSubclassTest, RemoveFilter) {
TestWindow window;
window.Init(NULL, gfx::Rect(0, 0, 100, 100));
EXPECT_TRUE(window.hwnd() != NULL);
{
TestMessageFilter mf1;
TestMessageFilter mf2;
HWNDSubclass::AddFilterToTarget(window.hwnd(), &mf1);
HWNDSubclass::AddFilterToTarget(window.hwnd(), &mf2);
::SendMessage(window.hwnd(), WM_NCHITTEST, 0, 0);
EXPECT_TRUE(mf1.saw_message);
EXPECT_TRUE(mf2.saw_message);
EXPECT_TRUE(window.saw_message);
mf1.saw_message = false;
mf2.saw_message = false;
window.saw_message = false;
// Remove a filter and try sending message again.
HWNDSubclass::RemoveFilterFromAllTargets(&mf1);
::SendMessage(window.hwnd(), WM_NCHITTEST, 0, 0);
EXPECT_FALSE(mf1.saw_message);
EXPECT_TRUE(mf2.saw_message);
EXPECT_TRUE(window.saw_message);
}
}
} // namespace ui
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