wavetable_playhead.cpp

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/*
Summary:
 
WavetablePlayhead represents a movable playhead line indicating a current position within a set of frames. Users can interact with it using mouse events to set a specific frame. The class supports customizable tick marks at regular intervals and notifies listeners whenever the playhead is moved.
 */
 
#include "wavetable_playhead.h"
 
#include "skin.h"
 
WavetablePlayhead::WavetablePlayhead(int num_positions) :
    SynthSection("Playhead"), position_quad_(Shaders::kColorFragment),
    padding_(0), num_positions_(num_positions), position_(0), drag_start_x_(0) {
  addOpenGlComponent(&position_quad_);
}
 
void WavetablePlayhead::setPosition(int position) {
  position_ = position;
 
  // Notify all registered listeners of the new position.
  for (Listener* listener : listeners_)
    listener->playheadMoved(position_);
 
  setPositionQuad();
}
 
void WavetablePlayhead::setPositionQuad() {
  float active_width = getWidth() - 2 * padding_ + 1;
  int x = (active_width * position_) / (num_positions_ - 1) - 0.5f + padding_;
  position_quad_.setBounds(x, 0, 1, getHeight());
}
 
void WavetablePlayhead::mouseDown(const MouseEvent& event) {
  mouseEvent(event);
}
 
void WavetablePlayhead::mouseDrag(const MouseEvent& event) {
  mouseEvent(event);
}
 
void WavetablePlayhead::mouseEvent(const MouseEvent& event) {
  float active_width = getWidth() - 2 * padding_ + 1;
  int position = std::roundf((num_positions_ - 1) * (event.x - padding_) / active_width);
  // Clamp the playhead position to the valid range and update.
  setPosition(std::max(std::min(position, num_positions_ - 1), 0));
}
 
void WavetablePlayhead::paintBackground(Graphics& g) {
  float active_width = getWidth() - 2 * padding_ + 1;
  g.setColour(findColour(Skin::kLightenScreen, true));
  // Draw tick marks at regular intervals
  int small_line_height = getHeight() / 3;
  int big_line_height = 2 * small_line_height;
  for (int i = 0; i < num_positions_; i += kLineSkip) {
    int x = padding_ - 0.5f + i * active_width / (num_positions_ - 1);
    if (i % kBigLineSkip == 0)
      g.fillRect(x, getHeight() - big_line_height, 1, big_line_height);
    else
      g.fillRect(x, getHeight() - small_line_height, 1, small_line_height);
  }
 
  // Set the playhead line color
  position_quad_.setColor(findColour(Skin::kWidgetPrimary1, true));
}
 
void WavetablePlayhead::resized() {
  SynthSection::resized();
  setPositionQuad();
}