slider.hpp

Go to the documentation of this file.

/*
    Copyright 2019-2021 natinusala
    Copyright 2019 p-sam
 
    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.
*/
 
#pragma once
 
#include <aurore/core/application.hpp>
#include <aurore/core/bind.hpp>
#include <aurore/core/box.hpp>
#include <aurore/views/label.hpp>
#include <aurore/views/rectangle.hpp>
 
namespace aurore
{
 
class Slider : public Box
{
  public:
    Slider();
 
    void onLayout() override;
    View* getDefaultFocus() override;
    void draw(NVGcontext* vg, float x, float y, float width, float height, Style style, FrameContext* ctx) override;
 
    void setProgress(float progress);
 
    float getProgress();
 
    Event<float>* getProgressEvent();
 
    void setStep(float step);
 
    void setDiscreteStep(float step);
 
    Event<float>* getInputProgressEvent();
 
    // Whether the user is moving it now (D-pad held, finger down)
    bool isProgressing();
 
    void setPointerSize(float size);
 
    static View* create();
 
  protected:
    // The knob takes the focus and says these: a slider, its cell's title,
    // its value as "40%".
    AccessibilityRole getDefaultAccessibilityRole() override { return AccessibilityRole::SLIDER; }
    std::string getDefaultAccessibilityLabel() override;
    std::string getDefaultAccessibilityValue() override;
 
  private:
    int announced = -1; // the value last said, in percent
    void announceValue();
 
    Rectangle* line;
    Rectangle* lineEmpty;
    Rectangle* pointer;
 
    Event<float> progressEvent;
    Event<float> inputProgressEvent;
    float discreteStep = 0;
    bool progressing   = false;
 
    float progress = 1;
    float step     = 0.5f;
 
    void buttonsProcessing();
    void moveByStep(int direction);
    void updateUI();
};
 
} // namespace aurore