Piano: Add a generic processor parameter widget

This automatically creates the correct collection of name label, value
label and "editor" (knob, checkbox, dropdown) depending on the processor
type and layouts them vertically.

3 files changed, 69 insertions, 0 deletions

diff --git a/Userland/Applications/Piano/CMakeLists.txt b/Userland/Applications/Piano/CMakeLists.txt
index 377b892a49..0fd50c01b1 100644
--- a/Userland/Applications/Piano/CMakeLists.txt
+++ b/Userland/Applications/Piano/CMakeLists.txt
@@ -17,6 +17,7 @@ set(SOURCES
     SamplerWidget.cpp
     WaveWidget.cpp
     ProcessorParameterWidget/Slider.cpp
+    ProcessorParameterWidget/ParameterWidget.cpp
 )
 
 serenity_app(Piano ICON app-piano)
diff --git a/Userland/Applications/Piano/ProcessorParameterWidget/ParameterWidget.cpp b/Userland/Applications/Piano/ProcessorParameterWidget/ParameterWidget.cpp
new file mode 100644
index 0000000000..23ba1105d4
--- /dev/null
+++ b/Userland/Applications/Piano/ProcessorParameterWidget/ParameterWidget.cpp
@@ -0,0 +1,41 @@
+/*
+ * Copyright (c) 2022, kleines Filmröllchen <filmroellchen@serenityos.org>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#include "ParameterWidget.h"
+#include "Dropdown.h"
+#include "Slider.h"
+#include "Toggle.h"
+#include <LibDSP/Synthesizers.h>
+#include <LibGUI/BoxLayout.h>
+
+ProcessorParameterWidget::ProcessorParameterWidget(DSP::ProcessorParameter& raw_parameter)
+    : m_parameter(raw_parameter)
+{
+    set_layout<GUI::VerticalBoxLayout>();
+    m_label = add<GUI::Label>(raw_parameter.name());
+    switch (raw_parameter.type()) {
+    case DSP::ParameterType::Range: {
+        auto& parameter = static_cast<DSP::ProcessorRangeParameter&>(raw_parameter);
+        m_value_label = add<GUI::Label>(String::number(static_cast<double>(parameter.value())));
+        m_parameter_modifier = add<ProcessorParameterSlider>(Orientation::Vertical, parameter, m_value_label);
+        break;
+    }
+    case DSP::ParameterType::Enum: {
+        // FIXME: We shouldn't do that, but the only user is the synth right now.
+        auto& parameter = static_cast<DSP::ProcessorEnumParameter<DSP::Synthesizers::Waveform>&>(raw_parameter);
+        auto enum_strings = Vector<String> { "Sine", "Triangle", "Square", "Saw", "Noise" };
+        m_parameter_modifier = add<ProcessorParameterDropdown<DSP::Synthesizers::Waveform>>(parameter, move(enum_strings));
+        break;
+    }
+    case DSP::ParameterType::Boolean: {
+        auto& parameter = static_cast<DSP::ProcessorBooleanParameter&>(raw_parameter);
+        m_parameter_modifier = add<ProcessorParameterToggle>(parameter);
+        break;
+    }
+    default:
+        VERIFY_NOT_REACHED();
+    }
+}
diff --git a/Userland/Applications/Piano/ProcessorParameterWidget/ParameterWidget.h b/Userland/Applications/Piano/ProcessorParameterWidget/ParameterWidget.h
new file mode 100644
index 0000000000..89baf3c24c
--- /dev/null
+++ b/Userland/Applications/Piano/ProcessorParameterWidget/ParameterWidget.h
@@ -0,0 +1,27 @@
+/*
+ * Copyright (c) 2022, kleines Filmröllchen <filmroellchen@serenityos.org>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#pragma once
+
+#include <AK/NonnullRefPtr.h>
+#include <AK/StdLibExtraDetails.h>
+#include <LibCore/Object.h>
+#include <LibDSP/ProcessorParameter.h>
+#include <LibGUI/Label.h>
+#include <LibGUI/Widget.h>
+
+class ProcessorParameterWidget : public GUI::Widget {
+    C_OBJECT(ProcessorParameterWidget)
+public:
+    ProcessorParameterWidget(DSP::ProcessorParameter& parameter);
+    virtual ~ProcessorParameterWidget() = default;
+
+private:
+    DSP::ProcessorParameter& m_parameter;
+    RefPtr<GUI::Widget> m_parameter_modifier;
+    RefPtr<GUI::Label> m_label;
+    RefPtr<GUI::Label> m_value_label;
+};