[Mac] Add cocoa implementation for sidebar extension action support

chrome/browser/ui/cocoa/sidebar_controller.mm

+// Copyright (c) 2015 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.
+
+#import "chrome/browser/ui/cocoa/sidebar_controller.h"
+
+#include <Cocoa/Cocoa.h>
+
+#include "base/prefs/pref_service.h"
+#include "chrome/browser/browser_process.h"
+#import "chrome/browser/ui/cocoa/view_id_util.h"
+#include "chrome/common/pref_names.h"
+#include "content/public/browser/web_contents.h"
+
+namespace {
+
+// By default sidebar width is 1/7th of the current page content width.
+const CGFloat kDefaultSidebarWidthRatio = 1.0f / 7.0f;
+const CGFloat kMaximumSidebarWidthRatio = 1.0f / 2.0f;
+
+}  // end namespace
+
+@interface SidebarController (Private)
+- (void)showSidebarContents:(content::WebContents*)sidebarContents;
+- (void)resizeSidebarToNewWidth:(CGFloat)width;
+@end
+
+@interface SidebarSplitView : NSSplitView
+@end
+
+@implementation SidebarSplitView
+- (NSColor*)dividerColor {
+  return [NSColor controlColor];
+}
+@end
+
+@implementation SidebarController
+
+- (id)initWithParentViewController:(id)parentController
+             andContentsController:(id)contentsController {
+  DCHECK(parentController);
+
+  if (self = [super init]) {
+    splitView_.reset([[SidebarSplitView alloc]
+        initWithFrame:[[parentController view] bounds]]);
+    [splitView_ setDelegate:self];
+    [splitView_ setVertical:YES];
+    [splitView_ setDividerStyle:NSSplitViewDividerStyleThin];
+    [splitView_ setAutoresizingMask:NSViewWidthSizable | NSViewHeightSizable];
+    [[parentController view] addSubview:splitView_];
+
+    [splitView_ addSubview:[contentsController view]];
+    [splitView_ adjustSubviews];
+  }
+  return self;
+}
+
+- (void)dealloc {
+  [splitView_ setDelegate:nil];
+  [super dealloc];
+}
+
+- (NSSplitView*)view {
+  return splitView_.get();
+}
+
+- (void)updateSidebarForTabContents:(content::WebContents*)tabContents
+                   sidebar_contents:(content::WebContents*)sidebarContents {
+
+  if (!contentsController_.get())
+    contentsController_.reset(
+        [[TabContentsController alloc] initWithContents:tabContents]);
+
+  content::WebContents* oldSidebarContents =
+      static_cast<content::WebContents*>([contentsController_ webContents]);
+  if (oldSidebarContents == sidebarContents)
+    return;
+
+  // Adjust sidebar view.
+  [self showSidebarContents:sidebarContents];
+}
+
+- (void)ensureContentsVisible {
+  [contentsController_ ensureContentsVisible];
+}
+
+- (content::WebContents*)currentSidebarContents {
+  if (!contentsController_.get())
+    return nil;
+
+  return static_cast<content::WebContents*>([contentsController_ webContents]);
+}
+
+- (void)showSidebarContents:(content::WebContents*)sidebarContents {
+  [contentsController_ ensureContentsSizeDoesNotChange];
+
+  NSArray* subviews = [splitView_ subviews];
+  if (sidebarContents) {
+    DCHECK_GE([subviews count], 1u);
+
+    // Native view is a TabContentsViewCocoa object, whose ViewID was
+    // set to VIEW_ID_TAB_CONTAINER initially, so change it to
+    // VIEW_ID_SIDE_BAR_CONTAINER here.
+    view_id_util::SetID(sidebarContents->GetNativeView(),
+                        VIEW_ID_SIDE_BAR_CONTAINER);
+
+    CGFloat sidebarWidth = 0;
+    if ([subviews count] == 1) {
+      // Load the default split offset.
+      sidebarWidth = g_browser_process->local_state()->GetInteger(
+          prefs::kExtensionSidebarWidth);
+      if (sidebarWidth < 0) {
+        // Initial load, set to default value.
+        sidebarWidth = NSWidth([splitView_ frame]) * kDefaultSidebarWidthRatio;
+      }
+
+      [splitView_ addSubview:[contentsController_ view]];
+    } else {
+      DCHECK_EQ([subviews count], 2u);
+      sidebarWidth = NSWidth([[subviews objectAtIndex:1] frame]);
+    }
+
+    sidebarWidth = std::max(static_cast<CGFloat>(0), sidebarWidth);
+
+    [self resizeSidebarToNewWidth:sidebarWidth];
+  } else {
+    if ([subviews count] > 1) {
+      NSView* oldSidebarContentsView = [subviews objectAtIndex:1];
+      // Store split offset when hiding sidebar window only.
+      int sidebarWidth = NSWidth([oldSidebarContentsView frame]);
+      g_browser_process->local_state()->SetInteger(
+          prefs::kExtensionSidebarWidth, sidebarWidth);
+      [oldSidebarContentsView removeFromSuperview];
+      [splitView_ adjustSubviews];
+    }
+  }
+
+  [contentsController_ changeWebContents:sidebarContents];
+}
+
+- (void)resizeSidebarToNewWidth:(CGFloat)width {
+  NSArray* subviews = [splitView_ subviews];
+
+  NSView* sidebarView = [subviews objectAtIndex:1];
+  NSRect sidebarFrame = [sidebarView frame];
+  sidebarFrame.size.width = width;
+  [sidebarView setFrame:sidebarFrame];
+
+  NSView* webView = [subviews objectAtIndex:0];
+  NSRect webFrame = [webView frame];
+  webFrame.size.width =
+      NSWidth([splitView_ frame]) - ([splitView_ dividerThickness] + width);
+  [webView setFrame:webFrame];
+
+  [splitView_ adjustSubviews];
+}
+
+/* NSSplitViewDelegate Support
+ *
+ * Sidebar behavior:
+ * - initial sidebar is kDefaultSidebarWidthRatio * width
+ *   of the split-view's frame
+ * - sidebar width is not allowed to be greater than 50% of width of the
+ *   the split-view's frame
+ *
+ */
+
+- (BOOL)splitView:(NSSplitView*)splitView
+    shouldHideDividerAtIndex:(NSInteger)dividerIndex {
+  return NO;
+}
+
+- (BOOL)splitView:(NSSplitView*)splitView canCollapseSubview:(NSView*)subview {
+  return NO;
+}
+
+- (BOOL)splitView:(NSSplitView*)splitView
+             shouldCollapseSubview:(NSView*)subview
+    forDoubleClickOnDividerAtIndex:(NSInteger)dividerIndex {
+  return NO;
+}
+
+- (CGFloat)splitView:(NSSplitView*)splitView
+    constrainMinCoordinate:(CGFloat)proposedMinimumPosition
+               ofSubviewAt:(NSInteger)dividerIndex {
+  return std::max(proposedMinimumPosition,
+                  kMaximumSidebarWidthRatio * NSWidth([splitView_ frame]));
+}
+
+- (CGFloat)splitView:(NSSplitView*)splitView
+    constrainMaxCoordinate:(CGFloat)proposedMaximumPosition
+               ofSubviewAt:(NSInteger)dividerIndex {
+  return std::min(proposedMaximumPosition,
+                  NSWidth([splitView_ frame]) - [splitView_ dividerThickness]);
+}
+
+@end