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// Copyright (c) 2006-2008 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 "chrome/browser/drag_utils.h"
#include <objidl.h>
#include <shlobj.h>
#include <shobjidl.h>
#include "base/file_util.h"
#include "base/gfx/gdi_util.h"
#include "base/gfx/point.h"
#include "base/string_util.h"
#include "chrome/app/theme/theme_resources.h"
#include "chrome/browser/views/bookmark_bar_view.h"
#include "chrome/common/gfx/chrome_canvas.h"
#include "chrome/common/gfx/chrome_font.h"
#include "chrome/common/os_exchange_data.h"
#include "chrome/common/resource_bundle.h"
#include "chrome/common/win_util.h"
#include "chrome/views/text_button.h"
#include "googleurl/src/gurl.h"
namespace drag_utils {
// Maximum width of the link drag image in pixels.
static const int kLinkDragImageMaxWidth = 200;
static const int kLinkDragImageVPadding = 3;
static const int kLinkDragImageVSpacing = 2;
static const int kLinkDragImageHPadding = 4;
static const SkColor kLinkDragImageBGColor = SkColorSetRGB(131, 146, 171);
//static const SkColor kLinkDragImageBGColor = SkColorSetRGB(195, 217, 255);
static const SkColor kLinkDragImageTextColor = SK_ColorBLACK;
// File dragging pixel measurements
static const int kFileDragImageMaxWidth = 200;
static const SkColor kFileDragImageTextColor = SK_ColorBLACK;
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 ChromeCanvas& 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 CreateDragImageForLink(const GURL& url,
const std::wstring& title,
IDataObject* data_object) {
// First calculate our dimensions.
ChromeFont title_font =
ResourceBundle::GetSharedInstance().GetFont(ResourceBundle::BaseFont).
DeriveFont(0, ChromeFont::BOLD);
ChromeFont url_font =
ResourceBundle::GetSharedInstance().GetFont(ResourceBundle::SmallFont);
const int title_height = title_font.height();
const int url_height = url_font.height();
const int width = kLinkDragImageMaxWidth;
const int height = kLinkDragImageVPadding * 2 + kLinkDragImageVSpacing +
title_height + url_height;
// Now create a canvas and render the dragged representation into it.
ChromeCanvas canvas(width, height, true);
// Paint the alpha layer
canvas.FillRectInt(SK_ColorWHITE, 0, 0,
kLinkDragImageMaxWidth, height); // kLinkDragImageTransparentColor
// Paint the background
SkPaint paint;
paint.setFlags(SkPaint::kAntiAlias_Flag);
paint.setStyle(SkPaint::kFill_Style);
paint.setColor(kLinkDragImageBGColor);
SkRect bounds_rect;
bounds_rect.set(0, 0, SkIntToScalar(width), SkIntToScalar(height));
canvas.drawRoundRect(bounds_rect, 3, 3, paint);
// Paint the link title
canvas.DrawStringInt(title, title_font, kLinkDragImageTextColor,
kLinkDragImageHPadding, kLinkDragImageVPadding,
kLinkDragImageMaxWidth - 2 * kLinkDragImageHPadding,
title_height);
// Paint the link URL
canvas.DrawStringInt(UTF8ToWide(url.spec()), url_font,
kLinkDragImageTextColor, kLinkDragImageHPadding,
kLinkDragImageVPadding + title_height +
kLinkDragImageVSpacing,
kLinkDragImageMaxWidth - 2 * kLinkDragImageHPadding,
url_height);
SetDragImageOnDataObject(canvas, kLinkDragImageMaxWidth, height,
kLinkDragImageMaxWidth / 2,
height - kLinkDragImageVPadding, data_object);
}
void SetURLAndDragImage(const GURL& url,
const std::wstring& title,
const SkBitmap& icon,
OSExchangeData* data) {
DCHECK(url.is_valid() && data);
data->SetURL(url, title);
// Create a button to render the drag image for us.
views::TextButton button(title.empty() ? UTF8ToWide(url.spec()) : title);
button.set_max_width(BookmarkBarView::kMaxButtonWidth);
if (icon.isNull()) {
button.SetIcon(*ResourceBundle::GetSharedInstance().GetBitmapNamed(
IDR_DEFAULT_FAVICON));
} else {
button.SetIcon(icon);
}
gfx::Size prefsize = button.GetPreferredSize();
button.SetBounds(0, 0, prefsize.width(), prefsize.height());
// Render the image.
ChromeCanvas canvas(prefsize.width(), prefsize.height(), false);
button.Paint(&canvas, true);
SetDragImageOnDataObject(canvas, prefsize.width(), prefsize.height(),
prefsize.width() / 2, prefsize.height() / 2,
data);
}
void CreateDragImageForFile(const std::wstring& file_name,
SkBitmap* icon,
IDataObject* data_object) {
DCHECK(icon);
DCHECK(data_object);
// Set up our text portion
const std::wstring& name = file_util::GetFilenameFromPath(file_name);
ResourceBundle& rb = ResourceBundle::GetSharedInstance();
ChromeFont font = rb.GetFont(ResourceBundle::BaseFont);
const int width = kFileDragImageMaxWidth;
const int height = font.height() + icon->height() + kLinkDragImageVPadding;
ChromeCanvas canvas(width, height, false /* translucent */);
// Paint the icon.
canvas.DrawBitmapInt(*icon, (width - icon->width()) / 2, 0);
// Paint the file name.
canvas.DrawStringInt(name, font, kFileDragImageTextColor,
0, icon->height() + kLinkDragImageVPadding,
width, font.height(), ChromeCanvas::TEXT_ALIGN_CENTER);
SetDragImageOnDataObject(canvas, width, height, width / 2,
kLinkDragImageVPadding, data_object);
}
void SetDragImageOnDataObject(const ChromeCanvas& canvas,
int width,
int height,
int cursor_x_offset,
int cursor_y_offset,
IDataObject* 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,
data_object);
}
} // namespace drag_utils
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