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// Copyright (c) 2009 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 "views/drag_utils.h"
#include <objidl.h>
#include <shlobj.h>
#include <shobjidl.h>
#include "app/gfx/canvas.h"
#include "app/gfx/gdi_util.h"
#include "app/os_exchange_data.h"
#include "app/os_exchange_data_provider_win.h"
namespace drag_utils {
static void SetDragImageOnDataObject(HBITMAP hbitmap,
int width,
int height,
int cursor_offset_x,
int cursor_offset_y,
IDataObject* data_object) {
IDragSourceHelper* helper = NULL;
HRESULT rv = CoCreateInstance(CLSID_DragDropHelper, 0, CLSCTX_INPROC_SERVER,
IID_IDragSourceHelper, reinterpret_cast<LPVOID*>(&helper));
if (SUCCEEDED(rv)) {
SHDRAGIMAGE sdi;
sdi.sizeDragImage.cx = width;
sdi.sizeDragImage.cy = height;
sdi.crColorKey = 0xFFFFFFFF;
sdi.hbmpDragImage = hbitmap;
sdi.ptOffset.x = cursor_offset_x;
sdi.ptOffset.y = cursor_offset_y;
helper->InitializeFromBitmap(&sdi, data_object);
}
};
// Blit the contents of the canvas to a new HBITMAP. It is the caller's
// responsibility to release the |bits| buffer.
static HBITMAP CreateBitmapFromCanvas(const gfx::Canvas& canvas,
int width,
int height) {
HDC screen_dc = GetDC(NULL);
BITMAPINFOHEADER header;
gfx::CreateBitmapHeader(width, height, &header);
void* bits;
HBITMAP bitmap =
CreateDIBSection(screen_dc, reinterpret_cast<BITMAPINFO*>(&header),
DIB_RGB_COLORS, &bits, NULL, 0);
HDC compatible_dc = CreateCompatibleDC(screen_dc);
HGDIOBJ old_object = SelectObject(compatible_dc, bitmap);
BitBlt(compatible_dc, 0, 0, width, height,
canvas.getTopPlatformDevice().getBitmapDC(),
0, 0, SRCCOPY);
SelectObject(compatible_dc, old_object);
ReleaseDC(NULL, compatible_dc);
ReleaseDC(NULL, screen_dc);
return bitmap;
}
void SetDragImageOnDataObject(const gfx::Canvas& canvas,
int width,
int height,
int cursor_x_offset,
int cursor_y_offset,
OSExchangeData* data_object) {
DCHECK(data_object && width > 0 && height > 0);
// SetDragImageOnDataObject(HBITMAP) takes ownership of the bitmap.
HBITMAP bitmap = CreateBitmapFromCanvas(canvas, width, height);
// Attach 'bitmap' to the data_object.
SetDragImageOnDataObject(
bitmap, width, height, cursor_x_offset, cursor_y_offset,
OSExchangeDataProviderWin::GetIDataObject(*data_object));
}
} // namespace drag_utils
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