[DevTools] Use special resizing strategy instead of insets.

chrome/browser/devtools/devtools_contents_resizing_strategy.cc

+// Copyright 2014 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/devtools/devtools_contents_resizing_strategy.h"
+
+DevToolsContentsResizingStrategy::DevToolsContentsResizingStrategy() {
+}
+
+DevToolsContentsResizingStrategy::DevToolsContentsResizingStrategy(
+    const gfx::Insets& insets, const gfx::Size& min_size)
+    : insets_(insets),
+      min_size_(min_size) {
+}
+
+void DevToolsContentsResizingStrategy::CopyFrom(
+    const DevToolsContentsResizingStrategy& strategy) {
+  insets_ = strategy.insets();
+  min_size_ = strategy.min_size();
+}
+
+bool DevToolsContentsResizingStrategy::Equals(
+    const DevToolsContentsResizingStrategy& strategy) {
+  return insets_ == strategy.insets() && min_size_ == strategy.min_size();
+}
+
+void ApplyDevToolsContentsResizingStrategy(
+    const DevToolsContentsResizingStrategy& strategy,
+    const gfx::Size& container_size,
+    const gfx::Rect& old_devtools_bounds,
+    const gfx::Rect& old_contents_bounds,
+    gfx::Rect* new_devtools_bounds,
+    gfx::Rect* new_contents_bounds) {
+  new_devtools_bounds->SetRect(
+      0, 0, container_size.width(), container_size.height());
+
+  const gfx::Insets& insets = strategy.insets();
+  const gfx::Size& min_size = strategy.min_size();
+
+  int width = std::max(0, container_size.width() - insets.width());
+  int left = insets.left();
+  if (width < min_size.width() && insets.width() > 0) {
+    int min_width = std::min(min_size.width(), container_size.width());
+    int insets_width = container_size.width() - min_width;
+    int insets_decrease = insets.width() - insets_width;
+    // Decrease both left and right insets proportionally.
+    left -= insets_decrease * insets.left() / insets.width();
+    width = min_width;
+  }
+  left = std::max(0, std::min(container_size.width(), left));
+
+  int height = std::max(0, container_size.height() - insets.height());
+  int top = insets.top();
+  if (height < min_size.height() && insets.height() > 0) {
+    int min_height = std::min(min_size.height(), container_size.height());
+    int insets_height = container_size.height() - min_height;
+    int insets_decrease = insets.height() - insets_height;
+    // Decrease both top and bottom insets proportionally.
+    top -= insets_decrease * insets.top() / insets.height();
+    height = min_height;
+  }
+  top = std::max(0, std::min(container_size.height(), top));
+
+  new_contents_bounds->SetRect(left, top, width, height);
+}