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// Copyright 2017 The Cobalt Authors. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include "starboard/shared/win32/dialog.h"
#include <windef.h>
#include <windows.h>
#include <windowsx.h>
#include <functional>
#include <vector>
#include "starboard/common/log.h"
#include "starboard/shared/win32/error_utils.h"
#include "starboard/shared/win32/wchar_utils.h"
typedef std::function<void()> DialogCallback;
using starboard::shared::win32::CStringToWString;
using starboard::shared::win32::DebugLogWinError;
namespace {
HWND g_current_dialog_handle = nullptr;
DialogCallback g_ok_callback;
DialogCallback g_cancel_callback;
} // namespace
// Wraps the win32 Dialog interface for building Dialogs at runtime.
// https://blogs.msdn.microsoft.com/oldnewthing/20050429-00/?p=35743
class DialogTemplateBuilder {
public:
LPCDLGTEMPLATE BuildTemplate() { return (LPCDLGTEMPLATE)&v[0]; }
void AlignToDword() {
if (v.size() % 4)
Write(NULL, 4 - (v.size() % 4));
}
void Write(LPCVOID pvWrite, DWORD cbWrite) {
v.insert(v.end(), cbWrite, 0);
if (pvWrite)
CopyMemory(&v[v.size() - cbWrite], pvWrite, cbWrite);
}
template <typename T>
void Write(T t) {
Write(&t, sizeof(T));
}
void WriteString(LPCWSTR psz) {
Write(psz, (lstrlenW(psz) + 1) * sizeof(WCHAR));
}
private:
std::vector<BYTE> v;
};
INT_PTR CALLBACK DialogProcedureCallback(HWND dialog_handle,
UINT message,
WPARAM w_param,
LPARAM l_param) {
SB_CHECK(!g_current_dialog_handle || dialog_handle == g_current_dialog_handle)
<< "Received callback on non-active dialog! Only one dialog at a time is "
"supported.";
switch (message) {
case WM_INITDIALOG:
return TRUE;
case WM_COMMAND:
auto command_id = GET_WM_COMMAND_ID(w_param, l_param);
if (command_id == IDCANCEL) {
g_cancel_callback();
} else if (command_id == IDOK) {
g_ok_callback();
} else {
return FALSE;
}
EndDialog(dialog_handle, 0);
g_current_dialog_handle = nullptr;
return TRUE;
}
return FALSE;
}
namespace starboard {
namespace shared {
namespace win32 {
bool ShowOkCancelDialog(HWND hwnd,
const std::string& title,
const std::string& message,
const std::string& ok_message,
DialogCallback ok_callback,
const std::string& cancel_message,
DialogCallback cancel_callback) {
if (g_current_dialog_handle != nullptr) {
SB_LOG(WARNING) << "Already showing a dialog; cancelling existing and "
"replacing with new dialog";
CancelDialog();
}
g_ok_callback = ok_callback;
g_cancel_callback = cancel_callback;
// Get the device context (DC) and from the system so we can scale our fonts
// correctly.
HDC hdc = GetDC(NULL);
SB_CHECK(hdc);
NONCLIENTMETRICSW ncm = {sizeof(ncm)};
bool retrieved_system_params =
SystemParametersInfoW(SPI_GETNONCLIENTMETRICS, 0, &ncm, 0);
if (!retrieved_system_params) {
DebugLogWinError();
ReleaseDC(NULL, hdc);
return false;
}
DialogTemplateBuilder dialog_template;
const int help_id = 0;
const int extended_style = 0;
const int window_width = 200;
const int window_height = 80;
const int window_x = 32;
const int window_y = 32;
const int edge_padding = 7;
const int button_height = 14;
const int button_width = 50;
const int button_y = window_height - button_height - edge_padding;
const int left_button_x = window_width / 2 - button_width - edge_padding / 2;
const int right_button_x = window_width / 2 + edge_padding / 2;
const int text_width = window_width - edge_padding * 2;
const int text_height = window_width - edge_padding * 3 - button_height;
const int extra_data = 0;
// Create a dialog template.
// The following MSDN blogposts explains how this is all laid out:
// https://blogs.msdn.microsoft.com/oldnewthing/20040623-00/?p=38753
// https://blogs.msdn.microsoft.com/oldnewthing/20050429-00/?p=35743
// More official documentation:
// https://msdn.microsoft.com/en-us/library/windows/desktop/ms644996(v=vs.85).aspx#modeless_box
dialog_template.Write<WORD>(1); // dialog version
dialog_template.Write<WORD>(0xFFFF); // extended dialog template
dialog_template.Write<DWORD>(help_id);
dialog_template.Write<DWORD>(extended_style);
dialog_template.Write<DWORD>(WS_CAPTION | WS_SYSMENU | DS_SETFONT |
DS_MODALFRAME);
dialog_template.Write<WORD>(3); // number of controls
dialog_template.Write<WORD>(window_x);
dialog_template.Write<WORD>(window_y);
dialog_template.Write<WORD>(window_width);
dialog_template.Write<WORD>(window_height);
dialog_template.WriteString(L""); // no menu
dialog_template.WriteString(L""); // default dialog class
// Title.
dialog_template.WriteString(
(LPCWSTR)starboard::shared::win32::CStringToWString(title.c_str())
.c_str());
// See following for info on how the font styling is calculated:
// https://msdn.microsoft.com/en-us/library/windows/desktop/ff684173(v=vs.85).aspx
if (ncm.lfMessageFont.lfHeight < 0) {
ncm.lfMessageFont.lfHeight =
-MulDiv(ncm.lfMessageFont.lfHeight, 72, GetDeviceCaps(hdc, LOGPIXELSY));
}
dialog_template.Write<WORD>((WORD)ncm.lfMessageFont.lfHeight);
dialog_template.Write<WORD>((WORD)ncm.lfMessageFont.lfWeight);
dialog_template.Write<BYTE>(ncm.lfMessageFont.lfItalic);
dialog_template.Write<BYTE>(ncm.lfMessageFont.lfCharSet);
dialog_template.WriteString(ncm.lfMessageFont.lfFaceName);
// Message text.
dialog_template.AlignToDword();
dialog_template.Write<DWORD>(help_id);
dialog_template.Write<DWORD>(extended_style);
dialog_template.Write<DWORD>(WS_CHILD | WS_VISIBLE);
dialog_template.Write<WORD>(edge_padding);
dialog_template.Write<WORD>(edge_padding);
dialog_template.Write<WORD>(text_width);
dialog_template.Write<WORD>(text_height);
dialog_template.Write<DWORD>((DWORD)-1);
dialog_template.Write<DWORD>(0x0082FFFF);
dialog_template.WriteString(
(LPCWSTR)starboard::shared::win32::CStringToWString(message.c_str())
.c_str());
dialog_template.Write<WORD>(extra_data);
// Cancel button.
dialog_template.AlignToDword();
dialog_template.Write<DWORD>(help_id);
dialog_template.Write<DWORD>(extended_style);
dialog_template.Write<DWORD>(WS_CHILD | WS_VISIBLE | WS_GROUP | WS_TABSTOP |
BS_DEFPUSHBUTTON);
dialog_template.Write<WORD>(left_button_x);
dialog_template.Write<WORD>(button_y);
dialog_template.Write<WORD>(button_width);
dialog_template.Write<WORD>(button_height);
dialog_template.Write<DWORD>(IDCANCEL);
dialog_template.Write<DWORD>(0x0080FFFF);
dialog_template.WriteString(
(LPCWSTR)starboard::shared::win32::CStringToWString(
cancel_message.c_str())
.c_str());
dialog_template.Write<WORD>(extra_data);
// Ok button.
dialog_template.AlignToDword();
dialog_template.Write<DWORD>(help_id);
dialog_template.Write<DWORD>(extended_style);
dialog_template.Write<DWORD>(WS_CHILD | WS_VISIBLE | WS_GROUP | WS_TABSTOP |
BS_DEFPUSHBUTTON); // style
dialog_template.Write<WORD>(right_button_x);
dialog_template.Write<WORD>(button_y);
dialog_template.Write<WORD>(button_width);
dialog_template.Write<WORD>(button_height);
dialog_template.Write<DWORD>(IDOK);
dialog_template.Write<DWORD>(0x0080FFFF);
dialog_template.WriteString(
(LPCWSTR)starboard::shared::win32::CStringToWString(ok_message.c_str())
.c_str());
dialog_template.Write<WORD>(extra_data);
ReleaseDC(NULL, hdc);
// Template is ready - go display it.
g_current_dialog_handle = CreateDialogIndirect(
GetModuleHandle(nullptr), dialog_template.BuildTemplate(), hwnd,
DialogProcedureCallback);
ShowWindow(g_current_dialog_handle, SW_SHOW);
return g_current_dialog_handle != nullptr;
}
bool DialogHandleMessage(MSG* msg) {
return IsWindow(g_current_dialog_handle) &&
IsDialogMessage(g_current_dialog_handle, msg);
}
void CancelDialog() {
if (g_current_dialog_handle != nullptr) {
EndDialog(g_current_dialog_handle, 0);
g_current_dialog_handle = nullptr;
}
}
} // namespace win32
} // namespace shared
} // namespace starboard