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      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
     73