Move chrome/browser/gtk/ to chrome/browser/ui/gtk/...

chrome/browser/gtk/rounded_window.cc

-// Copyright (c) 2010 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/gtk/rounded_window.h"
-
-#include <gtk/gtk.h>
-#include <math.h>
-
-#include "app/gtk_signal_registrar.h"
-#include "base/i18n/rtl.h"
-#include "base/logging.h"
-#include "chrome/browser/gtk/gtk_util.h"
-
-namespace gtk_util {
-
-namespace {
-
-const char* kRoundedData = "rounded-window-data";
-
-// If the border radius is less than |kMinRoundedBorderSize|, we don't actually
-// round the corners, we just truncate the corner.
-const int kMinRoundedBorderSize = 8;
-
-struct RoundedWindowData {
-  // Expected window size. Used to detect when we need to reshape the window.
-  int expected_width;
-  int expected_height;
-
-  // Color of the border.
-  GdkColor border_color;
-
-  // Radius of the edges in pixels.
-  int corner_size;
-
-  // Which corners should be rounded?
-  int rounded_edges;
-
-  // Which sides of the window should have an internal border?
-  int drawn_borders;
-
-  // Keeps track of attached signal handlers.
-  GtkSignalRegistrar signals;
-};
-
-// Callback from GTK to release allocated memory.
-void FreeRoundedWindowData(gpointer data) {
-  delete static_cast<RoundedWindowData*>(data);
-}
-
-enum FrameType {
-  FRAME_MASK,
-  FRAME_STROKE,
-};
-
-// Returns a list of points that either form the outline of the status bubble
-// (|type| == FRAME_MASK) or form the inner border around the inner edge
-// (|type| == FRAME_STROKE).
-std::vector<GdkPoint> MakeFramePolygonPoints(RoundedWindowData* data,
-                                             FrameType type) {
-  using gtk_util::MakeBidiGdkPoint;
-  int width = data->expected_width;
-  int height = data->expected_height;
-  int corner_size = data->corner_size;
-
-  std::vector<GdkPoint> points;
-
-  bool ltr = !base::i18n::IsRTL();
-  // If we have a stroke, we have to offset some of our points by 1 pixel.
-  // We have to inset by 1 pixel when we draw horizontal lines that are on the
-  // bottom or when we draw vertical lines that are closer to the end (end is
-  // right for ltr).
-  int y_off = (type == FRAME_MASK) ? 0 : -1;
-  // We use this one for LTR.
-  int x_off_l = ltr ? y_off : 0;
-  // We use this one for RTL.
-  int x_off_r = !ltr ? -y_off : 0;
-
-  // Build up points starting with the bottom left corner and continuing
-  // clockwise.
-
-  // Bottom left corner.
-  if (type == FRAME_MASK ||
-      (data->drawn_borders & (BORDER_LEFT | BORDER_BOTTOM))) {
-    if (data->rounded_edges & ROUNDED_BOTTOM_LEFT) {
-      if (corner_size >= kMinRoundedBorderSize) {
-        // We are careful to only add points that are horizontal or vertically
-        // offset from the previous point (not both).  This avoids rounding
-        // differences when two points are connected.
-        for (int x = 0; x <= corner_size; ++x) {
-          int y = static_cast<int>(sqrt(static_cast<double>(
-              (corner_size * corner_size) - (x * x))));
-          if (x > 0) {
-            points.push_back(MakeBidiGdkPoint(
-                corner_size - x + x_off_r + 1,
-                height - (corner_size - y) + y_off, width, ltr));
-          }
-          points.push_back(MakeBidiGdkPoint(
-              corner_size - x + x_off_r,
-              height - (corner_size - y) + y_off, width, ltr));
-        }
-      } else {
-        points.push_back(MakeBidiGdkPoint(
-            corner_size + x_off_l, height + y_off, width, ltr));
-        points.push_back(MakeBidiGdkPoint(
-            x_off_r, height - corner_size, width, ltr));
-      }
-    } else {
-      points.push_back(MakeBidiGdkPoint(x_off_r, height + y_off, width, ltr));
-    }
-  }
-
-  // Top left corner.
-  if (type == FRAME_MASK ||
-      (data->drawn_borders & (BORDER_LEFT | BORDER_TOP))) {
-    if (data->rounded_edges & ROUNDED_TOP_LEFT) {
-      if (corner_size >= kMinRoundedBorderSize) {
-        for (int x = corner_size; x >= 0; --x) {
-          int y = static_cast<int>(sqrt(static_cast<double>(
-              (corner_size * corner_size) - (x * x))));
-          points.push_back(MakeBidiGdkPoint(corner_size - x + x_off_r,
-              corner_size - y, width, ltr));
-          if (x > 0) {
-            points.push_back(MakeBidiGdkPoint(corner_size - x + 1 + x_off_r,
-                corner_size - y, width, ltr));
-          }
-        }
-      } else {
-        points.push_back(MakeBidiGdkPoint(
-            x_off_r, corner_size - 1, width, ltr));
-        points.push_back(MakeBidiGdkPoint(
-            corner_size + x_off_r - 1, 0, width, ltr));
-      }
-    } else {
-      points.push_back(MakeBidiGdkPoint(x_off_r, 0, width, ltr));
-    }
-  }
-
-  // Top right corner.
-  if (type == FRAME_MASK ||
-      (data->drawn_borders & (BORDER_TOP | BORDER_RIGHT))) {
-    if (data->rounded_edges & ROUNDED_TOP_RIGHT) {
-      if (corner_size >= kMinRoundedBorderSize) {
-        for (int x = 0; x <= corner_size; ++x) {
-          int y = static_cast<int>(sqrt(static_cast<double>(
-              (corner_size * corner_size) - (x * x))));
-          if (x > 0) {
-            points.push_back(MakeBidiGdkPoint(
-                width - (corner_size - x) + x_off_l - 1,
-                corner_size - y, width, ltr));
-          }
-          points.push_back(MakeBidiGdkPoint(
-              width - (corner_size - x) + x_off_l,
-              corner_size - y, width, ltr));
-        }
-      } else {
-        points.push_back(MakeBidiGdkPoint(
-            width - corner_size + 1 + x_off_l, 0, width, ltr));
-        points.push_back(MakeBidiGdkPoint(
-            width + x_off_l, corner_size - 1, width, ltr));
-      }
-    } else {
-      points.push_back(MakeBidiGdkPoint(
-          width + x_off_l, 0, width, ltr));
-    }
-  }
-
-  // Bottom right corner.
-  if (type == FRAME_MASK ||
-      (data->drawn_borders & (BORDER_RIGHT | BORDER_BOTTOM))) {
-    if (data->rounded_edges & ROUNDED_BOTTOM_RIGHT) {
-      if (corner_size >= kMinRoundedBorderSize) {
-        for (int x = corner_size; x >= 0; --x) {
-          int y = static_cast<int>(sqrt(static_cast<double>(
-              (corner_size * corner_size) - (x * x))));
-          points.push_back(MakeBidiGdkPoint(
-              width - (corner_size - x) + x_off_l,
-              height - (corner_size - y) + y_off, width, ltr));
-          if (x > 0) {
-            points.push_back(MakeBidiGdkPoint(
-                width - (corner_size - x) + x_off_l - 1,
-                height - (corner_size - y) + y_off, width, ltr));
-          }
-        }
-      } else {
-        points.push_back(MakeBidiGdkPoint(
-            width + x_off_l, height - corner_size, width, ltr));
-        points.push_back(MakeBidiGdkPoint(
-            width - corner_size + x_off_r, height + y_off, width, ltr));
-      }
-    } else {
-      points.push_back(MakeBidiGdkPoint(
-          width + x_off_l, height + y_off, width, ltr));
-    }
-  }
-
-  return points;
-}
-
-// Set the window shape in needed, lets our owner do some drawing (if it wants
-// to), and finally draw the border.
-gboolean OnRoundedWindowExpose(GtkWidget* widget,
-                               GdkEventExpose* event) {
-  RoundedWindowData* data = static_cast<RoundedWindowData*>(
-      g_object_get_data(G_OBJECT(widget), kRoundedData));
-
-  if (data->expected_width != widget->allocation.width ||
-      data->expected_height != widget->allocation.height) {
-    data->expected_width = widget->allocation.width;
-    data->expected_height = widget->allocation.height;
-
-    // We need to update the shape of the status bubble whenever our GDK
-    // window changes shape.
-    std::vector<GdkPoint> mask_points = MakeFramePolygonPoints(
-        data, FRAME_MASK);
-    GdkRegion* mask_region = gdk_region_polygon(&mask_points[0],
-                                                mask_points.size(),
-                                                GDK_EVEN_ODD_RULE);
-    gdk_window_shape_combine_region(widget->window, mask_region, 0, 0);
-    gdk_region_destroy(mask_region);
-  }
-
-  GdkDrawable* drawable = GDK_DRAWABLE(event->window);
-  GdkGC* gc = gdk_gc_new(drawable);
-  gdk_gc_set_clip_rectangle(gc, &event->area);
-  gdk_gc_set_rgb_fg_color(gc, &data->border_color);
-
-  // Stroke the frame border.
-  std::vector<GdkPoint> points = MakeFramePolygonPoints(
-      data, FRAME_STROKE);
-  if (data->drawn_borders == BORDER_ALL) {
-    // If we want to have borders everywhere, we need to draw a polygon instead
-    // of a set of lines.
-    gdk_draw_polygon(drawable, gc, FALSE, &points[0], points.size());
-  } else if (points.size() > 0) {
-    gdk_draw_lines(drawable, gc, &points[0], points.size());
-  }
-
-  g_object_unref(gc);
-  return FALSE;  // Propagate so our children paint, etc.
-}
-
-// On theme changes, window shapes are reset, but we detect whether we need to
-// reshape a window by whether its allocation has changed so force it to reset
-// the window shape on next expose.
-void OnStyleSet(GtkWidget* widget, GtkStyle* previous_style) {
-  DCHECK(widget);
-  RoundedWindowData* data = static_cast<RoundedWindowData*>(
-      g_object_get_data(G_OBJECT(widget), kRoundedData));
-  DCHECK(data);
-  data->expected_width = -1;
-  data->expected_height = -1;
-}
-
-}  // namespace
-
-void ActAsRoundedWindow(
-    GtkWidget* widget, const GdkColor& color, int corner_size,
-    int rounded_edges, int drawn_borders) {
-  DCHECK(widget);
-  DCHECK(!g_object_get_data(G_OBJECT(widget), kRoundedData));
-
-  gtk_widget_set_app_paintable(widget, TRUE);
-
-  RoundedWindowData* data = new RoundedWindowData;
-  data->signals.Connect(widget, "expose-event",
-                        G_CALLBACK(OnRoundedWindowExpose), NULL);
-  data->signals.Connect(widget, "style-set", G_CALLBACK(OnStyleSet), NULL);
-
-  data->expected_width = -1;
-  data->expected_height = -1;
-
-  data->border_color = color;
-  data->corner_size = corner_size;
-
-  data->rounded_edges = rounded_edges;
-  data->drawn_borders = drawn_borders;
-
-  g_object_set_data_full(G_OBJECT(widget), kRoundedData,
-                         data, FreeRoundedWindowData);
-
-  if (GTK_WIDGET_VISIBLE(widget))
-    gtk_widget_queue_draw(widget);
-}
-
-void StopActingAsRoundedWindow(GtkWidget* widget) {
-  g_object_set_data(G_OBJECT(widget), kRoundedData, NULL);
-
-  if (GTK_WIDGET_REALIZED(widget))
-    gdk_window_shape_combine_mask(widget->window, NULL, 0, 0);
-
-  if (GTK_WIDGET_VISIBLE(widget))
-    gtk_widget_queue_draw(widget);
-}
-
-bool IsActingAsRoundedWindow(GtkWidget* widget) {
-  return g_object_get_data(G_OBJECT(widget), kRoundedData) != NULL;
-}
-
-void SetRoundedWindowEdgesAndBorders(GtkWidget* widget,
-                                     int corner_size,
-                                     int rounded_edges,
-                                     int drawn_borders) {
-  DCHECK(widget);
-  RoundedWindowData* data = static_cast<RoundedWindowData*>(
-      g_object_get_data(G_OBJECT(widget), kRoundedData));
-  DCHECK(data);
-  data->corner_size = corner_size;
-  data->rounded_edges = rounded_edges;
-  data->drawn_borders = drawn_borders;
-}
-
-void SetRoundedWindowBorderColor(GtkWidget* widget, GdkColor color) {
-  DCHECK(widget);
-  RoundedWindowData* data = static_cast<RoundedWindowData*>(
-      g_object_get_data(G_OBJECT(widget), kRoundedData));
-  DCHECK(data);
-  data->border_color = color;
-}
-
-}  // namespace gtk_util