views: Add a slider control.

BUG=110130
TEST=none

Review URL: https://chromiumcodereview.appspot.com/9455082

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@123705 0039d316-1c4b-4281-b951-d872f2087c98

6 files changed, 253 insertions, 0 deletions

diff --git a/ui/views/controls/slider.cc b/ui/views/controls/slider.cc
new file mode 100644
index 0000000..64a8561
--- /dev/null
+++ b/ui/views/controls/slider.cc
@@ -0,0 +1,105 @@
+// Copyright (c) 2012 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 "ui/views/controls/slider.h"
+
+#include "base/logging.h"
+#include "third_party/skia/include/core/SkColor.h"
+#include "ui/gfx/canvas.h"
+#include "ui/gfx/point.h"
+#include "ui/gfx/rect.h"
+
+namespace views {
+
+Slider::Slider(SliderListener* listener, Orientation orientation)
+    : listener_(listener),
+      orientation_(orientation),
+      value_(0.f) {
+}
+
+Slider::~Slider() {
+}
+
+void Slider::SetValue(float value) {
+  if (value < 0.0)
+   value = 0.0;
+  else if (value > 1.0)
+    value = 1.0;
+  if (value_ == value)
+    return;
+  float old_value = value_;
+  value_ = value;
+  if (listener_)
+    listener_->SliderValueChanged(this, value_, old_value);
+  SchedulePaint();
+}
+
+gfx::Size Slider::GetPreferredSize() {
+  const int kSizeMajor = 200;
+  const int kSizeMinor = 40;
+
+  if (orientation_ == HORIZONTAL)
+    return gfx::Size(kSizeMajor, kSizeMinor);
+  return gfx::Size(kSizeMinor, kSizeMajor);
+}
+
+void Slider::OnPaint(gfx::Canvas* canvas) {
+  // TODO(sad): The painting code should use NativeTheme for various platforms.
+  const int kButtonMajor = 15;
+  const int kButtonMinor = 4;
+  const int kLineThickness = 5;
+  const SkColor kFullColor = SkColorSetARGB(125, 0, 0, 0);
+  const SkColor kEmptyColor = SkColorSetARGB(50, 0, 0, 0);
+  const SkColor kButtonColor = SK_ColorBLACK;
+
+  if (orientation_ == HORIZONTAL) {
+    int w = width() - kButtonMinor;
+    int full = value_ * w;
+    int empty = w - full;
+    int y = height() / 2 - kLineThickness / 2;
+    canvas->FillRect(gfx::Rect(kButtonMinor / 2, y,
+                               std::max(0, full - kButtonMinor / 2),
+                               kLineThickness),
+                     kFullColor);
+    canvas->FillRect(gfx::Rect(full + kButtonMinor / 2, y,
+                               std::max(0, empty), kLineThickness),
+                     kEmptyColor);
+    canvas->FillRect(gfx::Rect(std::max(0, full - kButtonMinor / 2),
+                               y - (kButtonMajor - kLineThickness) / 2,
+                               kButtonMinor,
+                               kButtonMajor),
+                     kButtonColor);
+  } else {
+    int h = height() - kButtonMinor;
+    int full = value_ * h;
+    int empty = h - full;
+    int x = width() / 2 - kLineThickness / 2;
+    canvas->FillRect(gfx::Rect(x, kButtonMinor / 2,
+                               kLineThickness,
+                               std::max(0, empty - kButtonMinor / 2)),
+                     kEmptyColor);
+    canvas->FillRect(gfx::Rect(x, empty + kButtonMinor / 2,
+                               kLineThickness, full),
+                     kFullColor);
+    canvas->FillRect(gfx::Rect(x - (kButtonMajor - kLineThickness) / 2,
+                               std::max(0, empty - kButtonMinor / 2),
+                               kButtonMajor,
+                               kButtonMinor),
+                     kButtonColor);
+  }
+}
+
+bool Slider::OnMousePressed(const views::MouseEvent& event) {
+  return OnMouseDragged(event);
+}
+
+bool Slider::OnMouseDragged(const views::MouseEvent& event) {
+  if (orientation_ == HORIZONTAL)
+    SetValue(static_cast<float>(event.x()) / width());
+  else
+    SetValue(1.0f - static_cast<float>(event.y()) / height());
+  return true;
+}
+
+}  // namespace views
diff --git a/ui/views/controls/slider.h b/ui/views/controls/slider.h
new file mode 100644
index 0000000..c70147d
--- /dev/null
+++ b/ui/views/controls/slider.h
@@ -0,0 +1,56 @@
+// Copyright (c) 2012 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.
+
+#ifndef UI_VIEWS_CONTROLS_SLIDER_H_
+#define UI_VIEWS_CONTROLS_SLIDER_H_
+#pragma once
+
+#include "ui/views/view.h"
+#include "ui/views/views_export.h"
+
+namespace views {
+
+class Slider;
+
+class VIEWS_EXPORT SliderListener {
+ public:
+  virtual void SliderValueChanged(Slider* sender,
+                                  float value,
+                                  float old_value) = 0;
+
+ protected:
+  virtual ~SliderListener() {}
+};
+
+class VIEWS_EXPORT Slider : public View {
+ public:
+  enum Orientation {
+    HORIZONTAL,
+    VERTICAL
+  };
+
+  Slider(SliderListener* listener, Orientation orientation);
+  virtual ~Slider();
+
+  float value() const { return value_; }
+  void SetValue(float value);
+
+ private:
+  // views::View overrides:
+  virtual gfx::Size GetPreferredSize() OVERRIDE;
+  virtual void OnPaint(gfx::Canvas* canvas) OVERRIDE;
+  virtual bool OnMousePressed(const views::MouseEvent& event) OVERRIDE;
+  virtual bool OnMouseDragged(const views::MouseEvent& event) OVERRIDE;
+
+  SliderListener* listener_;
+  Orientation orientation_;
+
+  float value_;
+
+  DISALLOW_COPY_AND_ASSIGN(Slider);
+};
+
+}  // namespace views
+
+#endif  // UI_VIEWS_CONTROLS_SLIDER_H_
diff --git a/ui/views/examples/examples_window.cc b/ui/views/examples/examples_window.cc
index ad125ce..f650b10 100644
--- a/ui/views/examples/examples_window.cc
+++ b/ui/views/examples/examples_window.cc
@@ -29,6 +29,7 @@
 #include "ui/views/examples/radio_button_example.h"
 #include "ui/views/examples/scroll_view_example.h"
 #include "ui/views/examples/single_split_view_example.h"
+#include "ui/views/examples/slider_example.h"
 #include "ui/views/examples/tabbed_pane_example.h"
 #include "ui/views/examples/table_example.h"
 #include "ui/views/examples/text_example.h"
@@ -177,6 +178,7 @@ class ExamplesWindowContents : public WidgetDelegateView,
     combobox_model_.AddExample(new RadioButtonExample);
     combobox_model_.AddExample(new ScrollViewExample);
     combobox_model_.AddExample(new SingleSplitViewExample);
+    combobox_model_.AddExample(new SliderExample);
     combobox_model_.AddExample(new TabbedPaneExample);
     combobox_model_.AddExample(new TextExample);
     combobox_model_.AddExample(new TextfieldExample);
diff --git a/ui/views/examples/slider_example.cc b/ui/views/examples/slider_example.cc
new file mode 100644
index 0000000..a1ab11e
--- /dev/null
+++ b/ui/views/examples/slider_example.cc
@@ -0,0 +1,44 @@
+// Copyright (c) 2012 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 "ui/views/examples/slider_example.h"
+
+#include "base/stringprintf.h"
+#include "base/utf_string_conversions.h"
+#include "ui/views/controls/label.h"
+#include "ui/views/layout/box_layout.h"
+#include "ui/views/view.h"
+
+namespace views {
+namespace examples {
+
+SliderExample::SliderExample()
+    : ExampleBase("Slider"),
+      slider_(NULL),
+      label_(NULL) {
+}
+
+SliderExample::~SliderExample() {
+}
+
+void SliderExample::CreateExampleView(View* container) {
+  label_ = new Label();
+  slider_ = new Slider(this, Slider::HORIZONTAL);
+
+  slider_->SetValue(0.5);
+
+  container->SetLayoutManager(new BoxLayout(BoxLayout::kHorizontal, 3, 3, 3));
+  container->AddChildView(slider_);
+  container->AddChildView(label_);
+}
+
+void SliderExample::SliderValueChanged(Slider* sender,
+                                       float value,
+                                       float old_value) {
+  label_->SetText(ASCIIToUTF16(base::StringPrintf("%.3lf", value)));
+}
+
+}  // namespace examples
+}  // namespace views
+
diff --git a/ui/views/examples/slider_example.h b/ui/views/examples/slider_example.h
new file mode 100644
index 0000000..a94a00c
--- /dev/null
+++ b/ui/views/examples/slider_example.h
@@ -0,0 +1,42 @@
+// Copyright (c) 2012 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.
+
+#ifndef UI_VIEWS_EXAMPLES_SLIDER_EXAMPLE_H_
+#define UI_VIEWS_EXAMPLES_SLIDER_EXAMPLE_H_
+#pragma once
+
+#include "base/basictypes.h"
+#include "base/compiler_specific.h"
+#include "ui/views/controls/slider.h"
+#include "ui/views/examples/example_base.h"
+
+namespace views {
+class Label;
+
+namespace examples {
+
+class SliderExample : public ExampleBase, public SliderListener {
+ public:
+  SliderExample();
+  virtual ~SliderExample();
+
+  // Overridden from ExampleBase:
+  virtual void CreateExampleView(View* container) OVERRIDE;
+
+ private:
+  // Overridden from SliderListener:
+  virtual void SliderValueChanged(Slider* sender,
+                                  float value,
+                                  float old_value) OVERRIDE;
+
+  Slider* slider_;
+  Label* label_;
+
+  DISALLOW_COPY_AND_ASSIGN(SliderExample);
+};
+
+}  // namespace examples
+}  // namespace views
+
+#endif  // UI_VIEWS_EXAMPLES_SLIDER_EXAMPLE_H_
diff --git a/ui/views/views.gyp b/ui/views/views.gyp
index 740b0cd..381838c 100644
--- a/ui/views/views.gyp
+++ b/ui/views/views.gyp
@@ -198,6 +198,8 @@
         'controls/single_split_view.cc',
         'controls/single_split_view.h',
         'controls/single_split_view_listener.h',
+        'controls/slider.cc',
+        'controls/slider.h',
         'controls/tabbed_pane/native_tabbed_pane_gtk.cc',
         'controls/tabbed_pane/native_tabbed_pane_gtk.h',
         'controls/tabbed_pane/native_tabbed_pane_views.cc',
@@ -660,6 +662,8 @@
         'examples/scroll_view_example.h',
         'examples/single_split_view_example.cc',
         'examples/single_split_view_example.h',
+        'examples/slider_example.cc',
+        'examples/slider_example.h',
         'examples/tabbed_pane_example.cc',
         'examples/tabbed_pane_example.h',
         'examples/table_example.cc',