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889315e8aa
If the underlying parameter is logarithmic, the slider respects that and switches to a logarithmic display. Currently, the used base is e, and we'll have to see in practice if 2 or 10 might be better. The parameters that make use of this, as can be seen in the previous commit, are all of the time dependent parameters such as the synth envelope parameters, as with these, usually fine-grained control at small time scales and coarser control at large time scales is desired. This was a good opportunity to refactor the slider step count into a constant.
57 lines
2.2 KiB
C++
57 lines
2.2 KiB
C++
/*
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* Copyright (c) 2021, kleines Filmröllchen <filmroellchen@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include "Slider.h"
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#include "WidgetWithLabel.h"
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#include <AK/FixedPoint.h>
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#include <AK/Math.h>
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ProcessorParameterSlider::ProcessorParameterSlider(Orientation orientation, LibDSP::ProcessorRangeParameter& parameter, RefPtr<GUI::Label> value_label)
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: Slider(orientation)
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, WidgetWithLabel(move(value_label))
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, m_parameter(parameter)
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{
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if (!is_logarithmic()) {
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set_range(m_parameter.min_value().raw(), m_parameter.max_value().raw());
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set_value(m_parameter.value().raw());
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set_step((m_parameter.min_value() - m_parameter.max_value()).raw() / slider_steps);
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} else {
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auto min_log = m_parameter.min_value().log2().raw();
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auto max_log = m_parameter.max_value().log2().raw();
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auto value_log = m_parameter.value().log2().raw();
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set_range(min_log, max_log);
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set_value(value_log);
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set_step((min_log - max_log) / slider_steps);
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}
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set_tooltip(m_parameter.name());
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m_value_label->set_text(String::formatted("{:.2f}", static_cast<double>(m_parameter)));
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on_change = [this](auto value) {
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LibDSP::ParameterFixedPoint real_value;
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real_value.raw() = value;
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if (is_logarithmic())
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// FIXME: Implement exponential for fixed point
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real_value = exp(static_cast<double>(real_value));
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m_parameter.set_value_sneaky(real_value, LibDSP::Detail::ProcessorParameterSetValueTag {});
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if (m_value_label) {
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double value = static_cast<double>(m_parameter);
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String label_text = String::formatted("{:.2f}", value);
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// FIXME: This is a magic value; we know that with normal font sizes, the label will disappear starting from approximately this length.
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// Can we do this dynamically?
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if (label_text.length() > 7)
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m_value_label->set_text(String::formatted("{:.0f}", value));
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else
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m_value_label->set_text(label_text);
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}
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};
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m_parameter.did_change_value = [this](auto value) {
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if (!is_logarithmic())
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set_value(value.raw());
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else
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set_value(value.log2().raw());
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};
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}
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