ui/views/examples/example_base.cc

   1 // Copyright (c) 2012 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 #include "ui/views/examples/example_base.h"
   6
   7 #include <stdarg.h>
   8
   9 #include "base/strings/stringprintf.h"
  10 #include "ui/views/view.h"
  11
  12 namespace views {
  13 namespace examples {
  14
  15 // Logs the specified string to the status area of the examples window.
  16 // This function can only be called if there is a visible examples window.
  17 void LogStatus(const std::string& status);
  18
  19 namespace {
  20
  21 // TODO(oshima): Check if this special container is still necessary.
  22 class ContainerView : public View {
  23  public:
  24   explicit ContainerView(ExampleBase* base)
  25       : example_view_created_(false),
  26         example_base_(base) {
  27   }
  28
  29  private:
  30   // View:
  31   void ViewHierarchyChanged(
  32       const ViewHierarchyChangedDetails& details) override {
  33     View::ViewHierarchyChanged(details);
  34     // We're not using child == this because a Widget may not be
  35     // available when this is added to the hierarchy.
  36     if (details.is_add && GetWidget() && !example_view_created_) {
  37       example_view_created_ = true;
  38       example_base_->CreateExampleView(this);
  39     }
  40   }
  41
  42   // True if the example view has already been created, or false otherwise.
  43   bool example_view_created_;
  44
  45   ExampleBase* example_base_;
  46
  47   DISALLOW_COPY_AND_ASSIGN(ContainerView);
  48 };
  49
  50 }  // namespace
  51
  52 ExampleBase::~ExampleBase() {}
  53
  54 ExampleBase::ExampleBase(const char* title) : example_title_(title) {
  55   container_ = new ContainerView(this);
  56 }
  57
  58 // Prints a message in the status area, at the bottom of the window.
  59 void ExampleBase::PrintStatus(const char* format, ...) {
  60   va_list ap;
  61   va_start(ap, format);
  62   std::string msg;
  63   base::StringAppendV(&msg, format, ap);
  64   LogStatus(msg);
  65 }
  66
  67 }  // namespace examples
  68 }  // namespace views