130 lines
4.4 KiB
C++
130 lines
4.4 KiB
C++
// Copyright (c) 2016 GitHub, Inc.
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// Use of this source code is governed by the MIT license that can be
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// found in the LICENSE file.
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#include "atom/browser/ui/drag_util.h"
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#if defined(OS_WIN)
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#include <objidl.h>
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#include <shlobj.h>
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#include <shobjidl.h>
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#include <stddef.h>
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#endif
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#include "ui/aura/window.h"
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#include "ui/base/dragdrop/drag_drop_types.h"
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#include "ui/base/dragdrop/drag_utils.h"
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#include "ui/base/dragdrop/file_info.h"
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#include "ui/base/dragdrop/os_exchange_data.h"
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#include "ui/gfx/geometry/point.h"
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#include "ui/gfx/screen.h"
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#include "ui/views/widget/widget.h"
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#include "ui/wm/public/drag_drop_client.h"
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#if defined(OS_WIN)
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#include "base/win/scoped_comptr.h"
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#include "base/win/scoped_hdc.h"
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#include "ui/base/dragdrop/os_exchange_data_provider_win.h"
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#include "ui/gfx/canvas.h"
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#include "ui/gfx/gdi_util.h"
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#include "ui/gfx/geometry/size.h"
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#include "ui/gfx/image/image_skia.h"
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#include "ui/gfx/skbitmap_operations.h"
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#endif
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namespace atom {
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namespace {
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#if defined(OS_WIN)
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void SetDragImageOnDataObject(HBITMAP hbitmap,
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const gfx::Size& size_in_pixels,
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const gfx::Vector2d& cursor_offset,
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IDataObject* data_object) {
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base::win::ScopedComPtr<IDragSourceHelper> helper;
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HRESULT rv = CoCreateInstance(CLSID_DragDropHelper, 0, CLSCTX_INPROC_SERVER,
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IID_IDragSourceHelper, helper.ReceiveVoid());
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if (SUCCEEDED(rv)) {
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SHDRAGIMAGE sdi;
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sdi.sizeDragImage = size_in_pixels.ToSIZE();
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sdi.crColorKey = 0xFFFFFFFF;
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sdi.hbmpDragImage = hbitmap;
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sdi.ptOffset = gfx::PointAtOffsetFromOrigin(cursor_offset).ToPOINT();
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helper->InitializeFromBitmap(&sdi, data_object);
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}
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}
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// Blit the contents of the canvas to a new HBITMAP. It is the caller's
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// responsibility to release the |bits| buffer.
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HBITMAP CreateHBITMAPFromSkBitmap(const SkBitmap& sk_bitmap) {
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base::win::ScopedGetDC screen_dc(NULL);
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BITMAPINFOHEADER header;
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gfx::CreateBitmapHeader(sk_bitmap.width(), sk_bitmap.height(), &header);
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void* bits;
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HBITMAP bitmap =
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CreateDIBSection(screen_dc, reinterpret_cast<BITMAPINFO*>(&header),
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DIB_RGB_COLORS, &bits, NULL, 0);
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if (!bitmap || !bits)
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return NULL;
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DCHECK_EQ(sk_bitmap.rowBytes(), static_cast<size_t>(sk_bitmap.width() * 4));
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SkAutoLockPixels lock(sk_bitmap);
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memcpy(
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bits, sk_bitmap.getPixels(), sk_bitmap.height() * sk_bitmap.rowBytes());
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return bitmap;
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}
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void SetDragImageOnDataObject(const gfx::ImageSkia& image_skia,
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const gfx::Vector2d& cursor_offset,
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ui::OSExchangeData* data_object) {
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DCHECK(data_object && !image_skia.size().IsEmpty());
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// InitializeFromBitmap() doesn't expect an alpha channel and is confused
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// by premultiplied colors, so unpremultiply the bitmap.
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// SetDragImageOnDataObject(HBITMAP) takes ownership of the bitmap.
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HBITMAP bitmap = CreateHBITMAPFromSkBitmap(
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SkBitmapOperations::UnPreMultiply(*image_skia.bitmap()));
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if (bitmap) {
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// Attach 'bitmap' to the data_object.
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SetDragImageOnDataObject(
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bitmap,
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gfx::Size(image_skia.bitmap()->width(), image_skia.bitmap()->height()),
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cursor_offset,
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ui::OSExchangeDataProviderWin::GetIDataObject(*data_object));
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}
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}
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#endif
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} // namespace
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void DragFileItems(const std::vector<base::FilePath>& files,
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const gfx::Image& icon,
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gfx::NativeView view) {
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// Set up our OLE machinery
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ui::OSExchangeData data;
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#if defined(OS_WIN)
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SetDragImageOnDataObject(icon.AsImageSkia(), gfx::Vector2d(), &data);
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#endif
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data.provider().SetDragImage(icon.AsImageSkia(), gfx::Vector2d());
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std::vector<ui::FileInfo> file_infos;
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for (const base::FilePath& file : files) {
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file_infos.push_back(ui::FileInfo(file, base::FilePath()));
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}
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data.SetFilenames(file_infos);
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aura::Window* root_window = view->GetRootWindow();
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if (!root_window || !aura::client::GetDragDropClient(root_window))
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return;
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gfx::Point location = gfx::Screen::GetScreen()->GetCursorScreenPoint();
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// TODO(varunjain): Properly determine and send DRAG_EVENT_SOURCE below.
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aura::client::GetDragDropClient(root_window)->StartDragAndDrop(
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data,
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root_window,
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view,
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location,
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ui::DragDropTypes::DRAG_COPY | ui::DragDropTypes::DRAG_LINK,
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ui::DragDropTypes::DRAG_EVENT_SOURCE_MOUSE);
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}
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} // namespace atom
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