gecko-dev/widget/windows/nsColorPicker.cpp

213 lines
5.2 KiB
C++

/* -*- 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"
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)
: 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_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));
}
}
return 0;
}
///////////////////////////////////////////////////////////////////////////////
// nsIColorPicker
nsColorPicker::nsColorPicker()
{
}
nsColorPicker::~nsColorPicker()
{
}
NS_IMPL_ISUPPORTS(nsColorPicker, nsIColorPicker)
NS_IMETHODIMP
nsColorPicker::Init(mozIDOMWindowProxy* parent,
const nsAString& title,
const nsAString& aInitialColor)
{
NS_PRECONDITION(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);
}