image-view-svg-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/devel-api/actors/actor-devel.h>
#include <string.h>
using namespace Dali;
namespace
{
const float MIN_SCALE = 0.6f;
const float MAX_SCALE = 6.f;
const char* SVG_IMAGES[] =
{
DEMO_IMAGE_DIR "Camera.svg",
DEMO_IMAGE_DIR "Contacts.svg",
DEMO_IMAGE_DIR "Mail.svg",
DEMO_IMAGE_DIR "Message.svg",
DEMO_IMAGE_DIR "Phone.svg",
DEMO_IMAGE_DIR "Settings.svg",
DEMO_IMAGE_DIR "World.svg",
DEMO_IMAGE_DIR "Kid1.svg"};
const unsigned int NUM_SVG_IMAGES(sizeof(SVG_IMAGES) / sizeof(SVG_IMAGES[0]));
const unsigned int NUM_IMAGES_DISPLAYED = 4u;
} // unnamed namespace
// This example shows how to display svg images with ImageView.
//
class ImageSvgController : public ConnectionTracker
{
public:
ImageSvgController(Application& application)
: mApplication(application),
mScale(1.f),
mIndex(0)
{
// Connect to the Application's Init signal
mApplication.InitSignal().Connect(this, &ImageSvgController::Create);
}
~ImageSvgController()
{
}
// The Init signal is received once (only) during the Application lifetime
void Create(Application& application)
{
// Get a handle to the window
Window window = application.GetWindow();
window.SetBackgroundColor(Color::WHITE);
Vector2 windowSize = window.GetSize();
mActorSize = windowSize / 2.f;
window.KeyEventSignal().Connect(this, &ImageSvgController::OnKeyEvent);
// Background, for receiving gestures
mWindowBackground = Actor::New();
mWindowBackground.SetProperty(Actor::Property::ANCHOR_POINT, AnchorPoint::TOP_CENTER);
mWindowBackground.SetProperty(Actor::Property::PARENT_ORIGIN, ParentOrigin::TOP_CENTER);
mWindowBackground.SetProperty(Actor::Property::SIZE, Vector2(windowSize.x, windowSize.y));
window.Add(mWindowBackground);
// Push button, for changing the image set for displaying
Toolkit::PushButton changeButton = Toolkit::PushButton::New();
changeButton.SetProperty(Toolkit::Button::Property::LABEL, "Next");
changeButton.SetProperty(Actor::Property::ANCHOR_POINT, AnchorPoint::TOP_RIGHT);
changeButton.SetProperty(Actor::Property::PARENT_ORIGIN, ParentOrigin::TOP_RIGHT);
window.Add(changeButton);
changeButton.ClickedSignal().Connect(this, &ImageSvgController::OnChangeButtonClicked);
// Push button, for resetting the actor size and position
Toolkit::PushButton resetButton = Toolkit::PushButton::New();
resetButton.SetProperty(Toolkit::Button::Property::LABEL, "Reset");
resetButton.SetProperty(Actor::Property::ANCHOR_POINT, AnchorPoint::TOP_LEFT);
resetButton.SetProperty(Actor::Property::PARENT_ORIGIN, ParentOrigin::TOP_LEFT);
window.Add(resetButton);
resetButton.ClickedSignal().Connect(this, &ImageSvgController::OnResetButtonClicked);
// Create and put imageViews to window
for(unsigned int i = 0; i < NUM_IMAGES_DISPLAYED; i++)
{
mSvgActor[i] = Toolkit::ImageView::New(SVG_IMAGES[mIndex + i]);
mSvgActor[i].SetProperty(Actor::Property::SIZE, mActorSize);
mSvgActor[i].TranslateBy(Vector3(0.0, windowSize.height * 0.05, 0.0f));
window.Add(mSvgActor[i]);
}
mSvgActor[0].SetProperty(Actor::Property::PARENT_ORIGIN, ParentOrigin::CENTER);
mSvgActor[0].SetProperty(Actor::Property::ANCHOR_POINT, AnchorPoint::BOTTOM_RIGHT);
mSvgActor[1].SetProperty(Actor::Property::PARENT_ORIGIN, ParentOrigin::CENTER);
mSvgActor[1].SetProperty(Actor::Property::ANCHOR_POINT, AnchorPoint::BOTTOM_LEFT);
mSvgActor[2].SetProperty(Actor::Property::PARENT_ORIGIN, ParentOrigin::CENTER);
mSvgActor[2].SetProperty(Actor::Property::ANCHOR_POINT, AnchorPoint::TOP_RIGHT);
mSvgActor[3].SetProperty(Actor::Property::PARENT_ORIGIN, ParentOrigin::CENTER);
mSvgActor[3].SetProperty(Actor::Property::ANCHOR_POINT, AnchorPoint::TOP_LEFT);
// Connect pan gesture for moving the actors
mPanGestureDetector = PanGestureDetector::New();
mPanGestureDetector.DetectedSignal().Connect(this, &ImageSvgController::OnPanGesture);
mPanGestureDetector.Attach(mWindowBackground);
// Connect pinch gesture for resizing the actors
mPinchGestureDetector = PinchGestureDetector::New();
mPinchGestureDetector.Attach(mWindowBackground);
mPinchGestureDetector.DetectedSignal().Connect(this, &ImageSvgController::OnPinch);
changeButton.RaiseToTop();
resetButton.RaiseToTop();
}
// Callback of push button, for changing image set
bool OnChangeButtonClicked(Toolkit::Button button)
{
mIndex = (mIndex + NUM_IMAGES_DISPLAYED) % NUM_SVG_IMAGES;
for(unsigned int i = 0; i < NUM_IMAGES_DISPLAYED; i++)
{
mSvgActor[i].SetImage(SVG_IMAGES[mIndex + i]);
}
return true;
}
// Callback of push button, for resetting image size and position
bool OnResetButtonClicked(Toolkit::Button button)
{
for(unsigned int i = 0; i < NUM_IMAGES_DISPLAYED; i++)
{
mSvgActor[i].SetProperty(Actor::Property::SIZE, mActorSize);
mSvgActor[i].SetProperty(Actor::Property::POSITION, Vector3::ZERO);
mScale = 1.f;
}
return true;
}
// Callback of pan gesture, for moving the actors
void OnPanGesture(Actor actor, const PanGesture& gesture)
{
if(gesture.GetState() == GestureState::CONTINUING)
{
for(unsigned int i = 0; i < NUM_IMAGES_DISPLAYED; i++)
{
mSvgActor[i].TranslateBy(Vector3(gesture.GetDisplacement()));
}
}
}
// Callback of pinch gesture, for resizing the actors
void OnPinch(Actor actor, const PinchGesture& gesture)
{
switch(gesture.GetState())
{
// Only scale the image when we start or continue pinching
case GestureState::STARTED:
case GestureState::CONTINUING:
{
float scale = std::max(gesture.GetScale(), MIN_SCALE / mScale);
scale = std::min(MAX_SCALE / mScale, scale);
for(unsigned int i = 0; i < NUM_IMAGES_DISPLAYED; i++)
{
mSvgActor[i].SetProperty(Actor::Property::SCALE, scale);
}
break;
}
case GestureState::FINISHED:
{
// Resize the image when pinching is complete, this will rasterize the SVG to the new size
mScale = mScale * gesture.GetScale();
mScale = mScale > MAX_SCALE ? MAX_SCALE : mScale;
mScale = mScale < MIN_SCALE ? MIN_SCALE : mScale;
for(unsigned int i = 0; i < NUM_IMAGES_DISPLAYED; i++)
{
mSvgActor[i].SetProperty(Actor::Property::SIZE, mActorSize * mScale);
mSvgActor[i].SetProperty(Actor::Property::SCALE, 1.0f);
}
break;
}
case GestureState::CANCELLED:
case GestureState::CLEAR:
case GestureState::POSSIBLE:
break;
}
}
/**
* Main key event handler
*/
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();
}
else
{
const char* keyName = event.GetKeyName().c_str();
if(strcmp(keyName, "Left") == 0)
{
if(mScale > MIN_SCALE)
{
mScale /= 1.1f;
}
for(unsigned int i = 0; i < NUM_IMAGES_DISPLAYED; i++)
{
mSvgActor[i].SetProperty(Actor::Property::SIZE, mActorSize * mScale);
}
}
else if(strcmp(keyName, "Right") == 0)
{
if(mScale < MAX_SCALE)
{
mScale *= 1.1f;
}
for(unsigned int i = 0; i < NUM_IMAGES_DISPLAYED; i++)
{
mSvgActor[i].SetProperty(Actor::Property::SIZE, mActorSize * mScale);
}
}
}
}
}
private:
Application& mApplication;
Actor mWindowBackground;
PanGestureDetector mPanGestureDetector;
PinchGestureDetector mPinchGestureDetector;
Toolkit::ImageView mSvgActor[4];
Vector2 mActorSize;
float mScale;
unsigned int mIndex;
};
int DALI_EXPORT_API main(int argc, char** argv)
{
Application application = Application::New(&argc, &argv);
ImageSvgController test(application);
application.MainLoop();
return 0;
}