1 // Copyright (c) 2011 The Chromium Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 #ifndef CHROME_BROWSER_UI_GTK_NINE_BOX_H_ 6 #define CHROME_BROWSER_UI_GTK_NINE_BOX_H_ 7 #pragma once 8 9 #include <gtk/gtk.h> 10 11 // A NineBox manages a set of source images representing a 3x3 grid, where 12 // non-corner images can be tiled to make a larger image. It's used to 13 // use bitmaps for constructing image-based resizable widgets like buttons. 14 // 15 // If you want just a vertical image that stretches in height but is fixed 16 // in width, only pass in images for the left column (leave others NULL). 17 // Similarly, for a horizontal image that stretches in width but is fixed in 18 // height, only pass in images for the top row. 19 // 20 // TODO(port): add support for caching server-side pixmaps of prerendered 21 // nineboxes. 22 class NineBox { 23 public: 24 // Construct a NineBox with nine images. Images are specified using resource 25 // ids that will be passed to the resource bundle. Use 0 for no image. 26 NineBox(int top_left, int top, int top_right, int left, int center, int right, 27 int bottom_left, int bottom, int bottom_right); 28 29 // Construct a NineBox from a single image and insets indicating the sizes 30 // of the edges and corners. 31 NineBox(int image, int top_margin, int bottom_margin, int left_margin, 32 int right_margin); 33 ~NineBox(); 34 35 // Render the NineBox to |dst|. 36 // The images will be tiled to fit into the widget. 37 void RenderToWidget(GtkWidget* dst) const; 38 39 // As above, but rendered partially transparent. 40 void RenderToWidgetWithOpacity(GtkWidget* dst, double opacity) const; 41 42 // Render the top row of images to |dst| between |x1| and |x1| + |width|. 43 // This is split from RenderToWidget so the toolbar can use it. 44 void RenderTopCenterStrip(cairo_t* cr, int x, int y, int width) const; 45 46 // Change all pixels that are white in |images_| to have 0 opacity. 47 void ChangeWhiteToTransparent(); 48 49 // Set the shape of |widget| to match that of the ninebox. Note that |widget| 50 // must have its own window and be allocated. Also, currently only the top 51 // three images are used. 52 // TODO(estade): extend this function to use all 9 images (if it's ever 53 // needed). 54 void ContourWidget(GtkWidget* widget) const; 55 56 private: 57 GdkPixbuf* images_[9]; 58 bool unref_pixbufs_on_destroy_; 59 }; 60 61 #endif // CHROME_BROWSER_UI_GTK_NINE_BOX_H_ 62
