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68 lines
2.1 KiB
C++
68 lines
2.1 KiB
C++
// Simple immediate mode UI implementation.
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//
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// Heavily inspired by Sol's tutorial at http://sol.gfxile.net/imgui/.
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//
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// A common pattern is Adapter classes for changing how things are drawn
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// in lists, for example.
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//
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// Immediate UI works great for overlay UI for games, for example, but is actually
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// not really a good idea for full app UIs. Also, animations are difficult because
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// there's not really any good place to store state.
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//
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// hrydgard@gmail.com
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#pragma once
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// Simple ID generators. Absolutely no guarantee of collision avoidance if you implement
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// multiple parts of a single screen of UI over multiple files unless you use IMGUI_SRC_ID.
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#ifdef IMGUI_SRC_ID
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#define GEN_ID (int)((IMGUI_SRC_ID) + (__LINE__))
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#define GEN_ID_LOOP(i) (int)((IMGUI_SRC_ID) + (__LINE__) + (i) * 13612)
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#else
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#define GEN_ID (__LINE__)
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#define GEN_ID_LOOP(i) ((__LINE__) + ((int)i) * 13612)
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#endif
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#include <string>
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#include <vector>
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#include "Common/Render/DrawBuffer.h"
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#include "Common/Input/InputState.h"
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class UIContext;
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struct Atlas;
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// This is the drawbuffer used for UI. Remember to flush it at the end of the frame.
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// TODO: One should probably pass it in through UIInit.
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extern DrawBuffer ui_draw2d;
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extern DrawBuffer ui_draw2d_front; // for things that need to be on top of the rest
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// TODO: These don't really belong here.
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// Implement this interface to style your lists
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class UIListAdapter {
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public:
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virtual ~UIListAdapter() {}
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virtual size_t getCount() const = 0;
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virtual void drawItem(int item, int x, int y, int w, int h, bool active) const = 0;
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virtual float itemHeight(int itemIndex) const { return 64; }
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virtual bool itemEnabled(int itemIndex) const { return true; }
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};
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class StringVectorListAdapter : public UIListAdapter {
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public:
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StringVectorListAdapter(const std::vector<std::string> *items) : items_(items) {}
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size_t getCount() const override { return items_->size(); }
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void drawItem(int item, int x, int y, int w, int h, bool active) const override;
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private:
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const std::vector<std::string> *items_;
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};
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// Begins/flushes the two UI drawbuffers together.
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void UIBegin(Draw::Pipeline *shaderSet);
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void UIFlush();
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