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Piano: Create controller widgets for processor parameters

These widgets attach to a processor parameter and keep the two sides in
sync. They will become very useful for smart processor interfaces.
This commit is contained in:
kleines Filmröllchen 2021-09-28 18:00:41 +02:00 committed by Linus Groh
parent 481f7d6afa
commit 8f8ae5eb53
6 changed files with 90 additions and 8 deletions

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/*
* Copyright (c) 2021, kleines Filmröllchen <malu.bertsch@gmail.com>.
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include "WidgetWithLabel.h"
#include <AK/Vector.h>
#include <LibDSP/ProcessorParameter.h>
#include <LibGUI/ComboBox.h>
#include <LibGUI/ItemListModel.h>
#include <LibGUI/Label.h>
#include <LibGUI/ModelIndex.h>
template<typename EnumT>
requires(IsEnum<EnumT>) class ProcessorParameterDropdown : public GUI::ComboBox {
C_OBJECT(ProcessorParameterDropdown);
public:
ProcessorParameterDropdown(LibDSP::ProcessorEnumParameter<EnumT>& parameter, Vector<String> modes)
: ComboBox()
, m_parameter(parameter)
, m_modes(move(modes))
{
auto model = GUI::ItemListModel<EnumT, Vector<String>>::create(m_modes);
set_model(model);
set_only_allow_values_from_model(true);
set_model_column(0);
set_selected_index(0);
m_parameter.set_value(static_cast<EnumT>(0));
on_change = [this]([[maybe_unused]] auto name, GUI::ModelIndex model_index) {
auto value = static_cast<EnumT>(model_index.row());
m_parameter.set_value_sneaky(value, LibDSP::Detail::ProcessorParameterSetValueTag {});
};
m_parameter.did_change_value = [this](auto new_value) {
set_selected_index(static_cast<int>(new_value));
};
}
// Release focus when escape is pressed
virtual void keydown_event(GUI::KeyEvent& event) override
{
if (event.key() == Key_Escape) {
if (is_focused())
set_focus(false);
event.accept();
} else {
GUI::ComboBox::keydown_event(event);
}
}
private:
LibDSP::ProcessorEnumParameter<EnumT>& m_parameter;
Vector<String> m_modes;
};

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/*
* Copyright (c) 2021, kleines Filmröllchen <malu.bertsch@gmail.com>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include "Slider.h"
#include "WidgetWithLabel.h"
ProcessorParameterSlider::ProcessorParameterSlider(Orientation orientation, LibDSP::ProcessorRangeParameter& parameter, RefPtr<GUI::Label> value_label)
: Slider(orientation)
, WidgetWithLabel(move(value_label))
, m_parameter(parameter)
{
set_range(m_parameter.min_value().raw(), m_parameter.max_value().raw());
set_value(m_parameter.value().raw());
set_step((m_parameter.min_value() - m_parameter.max_value()).raw() / 128);
set_tooltip(m_parameter.name());
m_value_label->set_text(String::formatted("{:.2f}", static_cast<double>(m_parameter)));
on_change = [this](auto value) {
LibDSP::ParameterFixedPoint real_value;
real_value.raw() = value;
m_parameter.set_value_sneaky(real_value, LibDSP::Detail::ProcessorParameterSetValueTag {});
if (m_value_label) {
double value = static_cast<double>(m_parameter);
String label_text = String::formatted("{:.2f}", value);
// FIXME: This is a magic value; we know that with normal font sizes, the label will disappear starting from approximately this length.
// Can we do this dynamically?
if (label_text.length() > 7)
m_value_label->set_text(String::formatted("{:.0f}", value));
else
m_value_label->set_text(label_text);
}
};
m_parameter.did_change_value = [this](auto value) {
set_value(value.raw());
};
}

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/*
* Copyright (c) 2021, kleines Filmröllchen <malu.bertsch@gmail.com>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include "WidgetWithLabel.h"
#include <LibDSP/ProcessorParameter.h>
#include <LibGUI/Label.h>
#include <LibGUI/Slider.h>
#include <LibGfx/Orientation.h>
class ProcessorParameterSlider
: public GUI::Slider
, public WidgetWithLabel {
C_OBJECT(ProcessorParameterSlider);
public:
ProcessorParameterSlider(Orientation, LibDSP::ProcessorRangeParameter&, RefPtr<GUI::Label>);
protected:
LibDSP::ProcessorRangeParameter& m_parameter;
};

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/*
* Copyright (c) 2021, kleines Filmröllchen <malu.bertsch@gmail.com>.
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include <AK/RefPtr.h>
#include <LibGUI/Label.h>
class WidgetWithLabel {
public:
WidgetWithLabel(RefPtr<GUI::Label> value_label)
: m_value_label(move(value_label))
{
}
RefPtr<GUI::Label> value_label() { return m_value_label; }
protected:
RefPtr<GUI::Label> m_value_label;
};