gradients-example.cpp
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/*
* Copyright (c) 2020 Samsung Electronics Co., Ltd.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*/
#include <dali-toolkit/dali-toolkit.h>
#include <dali-toolkit/devel-api/controls/control-devel.h>
#include <dali-toolkit/devel-api/visuals/visual-properties-devel.h>
#include "shared/view.h"
using namespace Dali;
using namespace Dali::Toolkit;
namespace
{
const char* const APPLICATION_TITLE("Color Gradients");
const char* const TOOLBAR_IMAGE(DEMO_IMAGE_DIR "top-bar.png");
const char* const CHANGE_ICON(DEMO_IMAGE_DIR "icon-change.png");
const char* const CHANGE_ICON_SELECTED(DEMO_IMAGE_DIR "icon-change-selected.png");
const char* const ROUNDED_CORNER_ICON(DEMO_IMAGE_DIR "icon-replace.png");
const char* const ROUNDED_CORNER_ICON_SELECTED(DEMO_IMAGE_DIR "icon-replace-selected.png");
constexpr Vector4 CORNER_RADIUS_VALUE(20.0f, 20.0f, 20.0f, 20.0f);
} // namespace
// This example shows how to render color gradients
//
class GradientController : public ConnectionTracker
{
public:
GradientController(Application& application)
: mApplication(application),
mIndex(0),
mRoundedCorner(false)
{
// Connect to the Application's Init signal
mApplication.InitSignal().Connect(this, &GradientController::Create);
}
~GradientController()
{
// Nothing to do here;
}
// The Init signal is received once (only) during the Application lifetime
void Create(Application& application)
{
// Get a handle to the window
auto window = application.GetWindow();
window.KeyEventSignal().Connect(this, &GradientController::OnKeyEvent);
// Creates a default view with a default tool bar.
// The view is added to the window.
Toolkit::ToolBar toolBar;
Layer content = DemoHelper::CreateView(application,
mView,
toolBar,
"",
TOOLBAR_IMAGE,
APPLICATION_TITLE);
PushButton changeButton = Toolkit::PushButton::New();
changeButton.SetProperty(Toolkit::Button::Property::UNSELECTED_BACKGROUND_VISUAL, CHANGE_ICON);
changeButton.SetProperty(Toolkit::Button::Property::SELECTED_BACKGROUND_VISUAL, CHANGE_ICON_SELECTED);
changeButton.ClickedSignal().Connect(this, &GradientController::OnChangeIconClicked);
toolBar.AddControl(changeButton,
DemoHelper::DEFAULT_VIEW_STYLE.mToolBarButtonPercentage,
Toolkit::Alignment::HORIZONTAL_RIGHT,
DemoHelper::DEFAULT_MODE_SWITCH_PADDING);
PushButton roundedCornerButton = Toolkit::PushButton::New();
roundedCornerButton.SetProperty(Toolkit::Button::Property::UNSELECTED_BACKGROUND_VISUAL, ROUNDED_CORNER_ICON);
roundedCornerButton.SetProperty(Toolkit::Button::Property::SELECTED_BACKGROUND_VISUAL, ROUNDED_CORNER_ICON_SELECTED);
roundedCornerButton.ClickedSignal().Connect(this, &GradientController::OnRoundedCornerClicked);
toolBar.AddControl(roundedCornerButton,
DemoHelper::DEFAULT_VIEW_STYLE.mToolBarButtonPercentage,
Toolkit::Alignment::HORIZONTAL_CENTER,
DemoHelper::DEFAULT_MODE_SWITCH_PADDING);
mGradientControl = Control::New();
mGradientControl.SetProperty(Actor::Property::ANCHOR_POINT, AnchorPoint::CENTER);
mGradientControl.SetProperty(Actor::Property::PARENT_ORIGIN, ParentOrigin::CENTER);
mGradientControl.SetResizePolicy(ResizePolicy::SIZE_RELATIVE_TO_PARENT, Dimension::ALL_DIMENSIONS);
Vector3 offset(0.9f, 0.7f, 0.0f);
mGradientControl.SetProperty(Actor::Property::SIZE_MODE_FACTOR, offset);
content.Add(mGradientControl);
// ---- Gradient for background
mGradientMap.Insert(Toolkit::Visual::Property::TYPE, Visual::GRADIENT);
Property::Array stopOffsets;
stopOffsets.PushBack(0.0f);
stopOffsets.PushBack(0.3f);
stopOffsets.PushBack(0.6f);
stopOffsets.PushBack(0.8f);
stopOffsets.PushBack(1.0f);
mGradientMap.Insert(GradientVisual::Property::STOP_OFFSET, stopOffsets);
Property::Array stopColors;
stopColors.PushBack(Vector4(129.f, 198.f, 193.f, 255.f) / 255.f);
stopColors.PushBack(Vector4(196.f, 198.f, 71.f, 122.f) / 255.f);
stopColors.PushBack(Vector4(214.f, 37.f, 139.f, 191.f) / 255.f);
stopColors.PushBack(Vector4(129.f, 198.f, 193.f, 150.f) / 255.f);
stopColors.PushBack(Color::YELLOW);
mGradientMap.Insert(GradientVisual::Property::STOP_COLOR, stopColors);
mGradientMap.Insert(DevelVisual::Property::CORNER_RADIUS, mRoundedCorner ? CORNER_RADIUS_VALUE : Vector4::ZERO);
UpdateGradientMap();
}
bool OnChangeIconClicked(Toolkit::Button button)
{
mIndex++;
UpdateGradientMap();
return true;
}
bool OnRoundedCornerClicked(Toolkit::Button button)
{
mRoundedCorner = !mRoundedCorner;
Animation animation = Animation::New(2.0f);
if(mRoundedCorner)
{
animation.AnimateTo(DevelControl::GetVisualProperty(mGradientControl, Control::Property::BACKGROUND, DevelVisual::Property::CORNER_RADIUS), CORNER_RADIUS_VALUE);
}
else
{
animation.AnimateTo(DevelControl::GetVisualProperty(mGradientControl, Control::Property::BACKGROUND, DevelVisual::Property::CORNER_RADIUS), Vector4::ZERO);
}
animation.Play();
return true;
}
void UpdateGradientMap()
{
Property::Map gradientMap;
switch(mIndex % 4)
{
case 0: // linear gradient with units as objectBoundingBox
{
gradientMap.Insert(GradientVisual::Property::START_POSITION, Vector2(0.5f, 0.5f));
gradientMap.Insert(GradientVisual::Property::END_POSITION, Vector2(-0.5f, -0.5f));
break;
}
case 1: // linear gradient with units as userSpaceOnUse
{
Vector2 halfWindowSize = Vector2(mApplication.GetWindow().GetSize()) * 0.5f;
gradientMap.Insert(GradientVisual::Property::START_POSITION, halfWindowSize);
gradientMap.Insert(GradientVisual::Property::END_POSITION, -halfWindowSize);
gradientMap.Insert(GradientVisual::Property::UNITS, GradientVisual::Units::USER_SPACE);
break;
}
case 2: // radial gradient with units as objectBoundingBox
{
gradientMap.Insert(GradientVisual::Property::CENTER, Vector2(0.5f, 0.5f));
gradientMap.Insert(GradientVisual::Property::RADIUS, 1.414f);
break;
}
default: // radial gradient with units as userSpaceOnUse
{
Vector2 windowSize = mApplication.GetWindow().GetSize();
gradientMap.Insert(GradientVisual::Property::CENTER, windowSize * 0.5f);
gradientMap.Insert(GradientVisual::Property::RADIUS, windowSize.Length());
gradientMap.Insert(GradientVisual::Property::UNITS, GradientVisual::Units::USER_SPACE);
break;
}
}
gradientMap.Merge(mGradientMap);
mGradientControl.SetProperty(Control::Property::BACKGROUND, gradientMap);
}
void OnKeyEvent(const KeyEvent& event)
{
if(event.GetState() == KeyEvent::DOWN)
{
if(IsKey(event, Dali::DALI_KEY_ESCAPE) || IsKey(event, Dali::DALI_KEY_BACK))
{
mApplication.Quit();
}
}
}
private:
Application& mApplication;
Property::Map mGradientMap;
Control mView;
Control mGradientControl;
unsigned mIndex;
bool mRoundedCorner;
};
int DALI_EXPORT_API main(int argc, char** argv)
{
Application application = Application::New(&argc, &argv);
GradientController test(application);
application.MainLoop();
return 0;
}