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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "nsColorPicker.h"
#include <shlwapi.h>
#include "mozilla/AutoRestore.h"
#include "nsIWidget.h"
#include "nsString.h"
#include "WidgetUtils.h"
#include "nsPIDOMWindow.h"
using namespace mozilla::widget;
namespace {
// Manages NS_NATIVE_TMP_WINDOW child windows. NS_NATIVE_TMP_WINDOWs are
// temporary child windows of mParentWidget created to address RTL issues
// in picker dialogs. We are responsible for destroying these.
class AutoDestroyTmpWindow {
public:
explicit AutoDestroyTmpWindow(HWND aTmpWnd) : mWnd(aTmpWnd) {}
~AutoDestroyTmpWindow() {
if (mWnd) DestroyWindow(mWnd);
}
inline HWND get() const { return mWnd; }
private:
HWND mWnd;
};
static DWORD ColorStringToRGB(const nsAString& aColor) {
DWORD result = 0;
for (uint32_t i = 1; i < aColor.Length(); ++i) {
result *= 16;
char16_t c = aColor[i];
if (c >= '0' && c <= '9') {
result += c - '0';
} else if (c >= 'a' && c <= 'f') {
result += 10 + (c - 'a');
} else {
result += 10 + (c - 'A');
}
}
DWORD r = result & 0x00FF0000;
DWORD g = result & 0x0000FF00;
DWORD b = result & 0x000000FF;
r = r >> 16;
b = b << 16;
result = r | g | b;
return result;
}
static nsString ToHexString(BYTE n) {
nsString result;
if (n <= 0x0F) {
result.Append('0');
}
result.AppendInt(n, 16);
return result;
}
static void BGRIntToRGBString(DWORD color, nsAString& aResult) {
BYTE r = GetRValue(color);
BYTE g = GetGValue(color);
BYTE b = GetBValue(color);
aResult.Assign('#');
aResult.Append(ToHexString(r));
aResult.Append(ToHexString(g));
aResult.Append(ToHexString(b));
}
} // namespace
static AsyncColorChooser* gColorChooser;
AsyncColorChooser::AsyncColorChooser(COLORREF aInitialColor,
nsIWidget* aParentWidget,
nsIColorPickerShownCallback* aCallback)
: mozilla::Runnable("AsyncColorChooser"),
mInitialColor(aInitialColor),
mColor(aInitialColor),
mParentWidget(aParentWidget),
mCallback(aCallback) {}
NS_IMETHODIMP
AsyncColorChooser::Run() {
static COLORREF sCustomColors[16] = {0};
MOZ_ASSERT(NS_IsMainThread(),
"Color pickers can only be opened from main thread currently");
// Allow only one color picker to be opened at a time, to workaround bug
// 944737
if (!gColorChooser) {
mozilla::AutoRestore<AsyncColorChooser*> restoreColorChooser(gColorChooser);
gColorChooser = this;
AutoDestroyTmpWindow adtw((HWND)(
mParentWidget.get() ? mParentWidget->GetNativeData(NS_NATIVE_TMP_WINDOW)
: nullptr));
CHOOSECOLOR options;
options.lStructSize = sizeof(options);
options.hwndOwner = adtw.get();
options.Flags = CC_RGBINIT | CC_FULLOPEN | CC_ENABLEHOOK;
options.rgbResult = mInitialColor;
options.lpCustColors = sCustomColors;
options.lpfnHook = HookProc;
mColor = ChooseColor(&options) ? options.rgbResult : mInitialColor;
} else {
NS_WARNING(
"Currently, it's not possible to open more than one color "
"picker at a time");
mColor = mInitialColor;
}
if (mCallback) {
nsAutoString colorStr;
BGRIntToRGBString(mColor, colorStr);
mCallback->Done(colorStr);
}
return NS_OK;
}
void AsyncColorChooser::Update(COLORREF aColor) {
if (mColor != aColor) {
mColor = aColor;
nsAutoString colorStr;
BGRIntToRGBString(mColor, colorStr);
mCallback->Update(colorStr);
}
}
/* static */ UINT_PTR CALLBACK AsyncColorChooser::HookProc(HWND aDialog,
UINT aMsg,
WPARAM aWParam,
LPARAM aLParam) {
if (!gColorChooser) {
return 0;
}
if (aMsg == WM_INITDIALOG) {
// "The default dialog box procedure processes the WM_INITDIALOG message
// before passing it to the hook procedure.
// For all other messages, the hook procedure receives the message first."
// https://docs.microsoft.com/en-us/windows/win32/api/commdlg/nc-commdlg-lpcchookproc
// "The dialog box procedure should return TRUE to direct the system to
// set the keyboard focus to the control specified by wParam."
// https://docs.microsoft.com/en-us/windows/win32/dlgbox/wm-initdialog
return 1;
}
if (aMsg == WM_CTLCOLORSTATIC) {
// The color picker does not expose a proper way to retrieve the current
// color, so we need to obtain it from the static control displaying the
// current color instead.
const int kCurrentColorBoxID = 709;
if ((HWND)aLParam == GetDlgItem(aDialog, kCurrentColorBoxID)) {
gColorChooser->Update(GetPixel((HDC)aWParam, 0, 0));
}
}
// Let the default dialog box procedure processes the message.
return 0;
}
///////////////////////////////////////////////////////////////////////////////
// nsIColorPicker
nsColorPicker::nsColorPicker() {}
nsColorPicker::~nsColorPicker() {}
NS_IMPL_ISUPPORTS(nsColorPicker, nsIColorPicker)
NS_IMETHODIMP
nsColorPicker::Init(mozIDOMWindowProxy* parent, const nsAString& title,
const nsAString& aInitialColor) {
MOZ_ASSERT(parent,
"Null parent passed to colorpicker, no color picker for you!");
mParentWidget =
WidgetUtils::DOMWindowToWidget(nsPIDOMWindowOuter::From(parent));
mInitialColor = ColorStringToRGB(aInitialColor);
return NS_OK;
}
NS_IMETHODIMP
nsColorPicker::Open(nsIColorPickerShownCallback* aCallback) {
NS_ENSURE_ARG(aCallback);
nsCOMPtr<nsIRunnable> event =
new AsyncColorChooser(mInitialColor, mParentWidget, aCallback);
return NS_DispatchToMainThread(event);
}
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