ui/views/examples/progress_bar_example.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/progress_bar_example.h"
   6
   7 #include <algorithm>
   8
   9 #include "base/strings/utf_string_conversions.h"
  10 #include "ui/views/controls/button/label_button.h"
  11 #include "ui/views/controls/progress_bar.h"
  12 #include "ui/views/layout/grid_layout.h"
  13 #include "ui/views/view.h"
  14
  15 namespace {
  16
  17 const double kStepSize = 0.1;
  18
  19 double SetToMax(double percent) {
  20   return std::min(std::max(percent, 0.0), 1.0);
  21 }
  22
  23 }  // namespace
  24
  25 namespace views {
  26 namespace examples {
  27
  28 ProgressBarExample::ProgressBarExample()
  29     : ExampleBase("Progress Bar"),
  30       minus_button_(NULL),
  31       plus_button_(NULL),
  32       progress_bar_(NULL),
  33       current_percent_(0.0) {
  34 }
  35
  36 ProgressBarExample::~ProgressBarExample() {
  37 }
  38
  39 void ProgressBarExample::CreateExampleView(View* container) {
  40   GridLayout* layout = new GridLayout(container);
  41   container->SetLayoutManager(layout);
  42
  43   ColumnSet* column_set = layout->AddColumnSet(0);
  44   column_set->AddColumn(GridLayout::LEADING, GridLayout::FILL,
  45                         0, GridLayout::USE_PREF, 0, 0);
  46   column_set->AddPaddingColumn(0, 8);
  47   column_set->AddColumn(GridLayout::FILL, GridLayout::FILL,
  48                         1, GridLayout::USE_PREF, 0, 0);
  49   column_set->AddPaddingColumn(0, 8);
  50   column_set->AddColumn(GridLayout::TRAILING, GridLayout::FILL,
  51                         0, GridLayout::USE_PREF, 0, 0);
  52
  53   layout->StartRow(0, 0);
  54   minus_button_ = new LabelButton(this, base::ASCIIToUTF16("-"));
  55   layout->AddView(minus_button_);
  56   progress_bar_ = new ProgressBar();
  57   layout->AddView(progress_bar_);
  58   plus_button_ = new LabelButton(this, base::ASCIIToUTF16("+"));
  59   layout->AddView(plus_button_);
  60 }
  61
  62 void ProgressBarExample::ButtonPressed(Button* sender, const ui::Event& event) {
  63   if (sender == minus_button_)
  64     current_percent_ = SetToMax(current_percent_ - kStepSize);
  65   else if (sender == plus_button_)
  66     current_percent_ = SetToMax(current_percent_ + kStepSize);
  67
  68   progress_bar_->SetValue(current_percent_);
  69 }
  70
  71 }  // namespace examples
  72 }  // namespace views