controls/controls.cpp

The common controls as label/value rows: buttons, toggles, text and number fields, a slider, a color, a menu and tabs.

The common controls as label/value rows: buttons, toggles, text and number fields, a slider, a color, a menu and tabs.Walkthrough: Controls.

// Controls overview: the common controls, laid out as label/value rows.
#include <gui_controls/gui_application.h>
 
#include <cstdio>
 
#include <string>
 
class ControlsApp : public tachyon::GUIApplication
{
public:
    tachyon::Result<void> Initialize(const InitializeOptions& options = {}) override
    {
        if (tachyon::Result<void> result = GUIApplication::Initialize(options); !result)
            return result;
        windowID = idManager.CreateStaticID();
        menuID   = idManager.CreateStaticID();
        return {};
    }
 
    void OnGUI() override
    {
        // The scope ends the window when it leaves, open or not.
        auto window = Window(windowID, "Controls", tachyon::LayoutOverride{}.Size(480, 560));
        if (!window)
            return;
        BeginVertical(tachyon::LayoutOverride{}.FlexGrow(1));
 
        // A label group lines up Label + control pairs as rows with a shared,
        // resizable label column. DragLabel also drags the value it labels.
        BeginLabelGroup(140);
 
        Label("Button");
        Button("Click me", [this] { ++clicks; });
 
        Label("Clicks");
        Text(std::to_string(clicks));
 
        Label("Checkbox");
        Field(enabled, enabled ? "On" : "Off");
 
        Label("Toggles");
        BeginHorizontal();
        Toggle(bold, "B");
        Toggle(italic, "I");
        Toggle(underline, "U");
        EndHorizontal();
 
        Label("Text");
        Field(text);
 
        Label("Multiline");
        Field(notes, tachyon::TextEditBehavior::ContinuousUpdate | tachyon::TextEditBehavior::Multiline);
 
        DragLabel("Float");
        Field(floatValue);
 
        DragLabel("Int [0, 10]");
        Field(intValue, tachyon::NumericFieldConfig<int>{ .minVal = 0, .maxVal = 10 });
 
        DragLabel("Vector");
        Field(position);
 
        Label("Slider");
        SliderField(volume, 0.0f, 100.0f, "Volume");
 
        Label("Color");
        ColorField(color);
 
        Label("Menu");
        if (BeginMenu(menuID, "Choose...", tachyon::LayoutOverride{}.NoGrow().NoShrink()))
        {
            for (const char* item : { "Apple", "Banana", "Cherry" })
                MenuItem(item, [this, item] { choice = item; });
        }
        EndMenu();
 
        Label("Chosen");
        Text(choice);
 
        EndLabelGroup();
 
        // Tabs select which content to show; the content is up to the app.
        BeginTabBar(idManager.AllocateDynamicID("tabs"), &selectedTab, nullptr);
        Tab("First");
        Tab("Second");
        EndTabBar();
        Text(selectedTab == 0 ? "Content of the first tab" : "Content of the second tab");
 
        EndVertical();
    }
 
private:
    tachyon::ID      windowID = tachyon::ID::Invalid();
    tachyon::ID      menuID   = tachyon::ID::Invalid();
    int              clicks   = 0;
    bool             enabled  = true;
    bool             bold = false, italic = false, underline = false;
    std::string      text     = "Edit me";
    std::string      notes    = "Line one\nLine two";
    float            floatValue = 1.5f;
    int              intValue   = 5;
    tachyon::float3  position { 1.0f, 2.0f, 3.0f };
    float            volume   = 75.0f;
    tachyon::color4f color    { 0.2f, 0.6f, 1.0f, 1.0f };
    std::string      choice   = "(none)";
    int              selectedTab = 0;
};
 
int main()
{
    ControlsApp app;
    tachyon::Result<void> result = app.Initialize();
    if (result)
        result = app.Run();
    app.Cleanup();
    if (!result)
    {
        std::fprintf(stderr, "%s\n", result.GetError().message.c_str());
        return 1;
    }
    return 0;
}