begin cleanup from other project
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198
lib/context_wrapper.h
Executable file
198
lib/context_wrapper.h
Executable file
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#pragma once
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#include "imgui.h"
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#include "imgui_internal.h"
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inline static void CopyIOEvents(ImGuiContext *src, ImGuiContext *dst,
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ImVec2 origin, float scale) {
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dst->InputEventsQueue = src->InputEventsTrail;
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for (ImGuiInputEvent &e : dst->InputEventsQueue) {
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if (e.Type == ImGuiInputEventType_MousePos) {
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e.MousePos.PosX = (e.MousePos.PosX - origin.x) / scale;
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e.MousePos.PosY = (e.MousePos.PosY - origin.y) / scale;
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}
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}
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}
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inline static void AppendDrawData(ImDrawList *src, ImVec2 origin, float scale) {
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// TODO optimize if vtx_start == 0 || if idx_start == 0
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ImDrawList *dl = ImGui::GetWindowDrawList();
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const int vtx_start = dl->VtxBuffer.size();
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const int idx_start = dl->IdxBuffer.size();
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dl->VtxBuffer.resize(dl->VtxBuffer.size() + src->VtxBuffer.size());
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dl->IdxBuffer.resize(dl->IdxBuffer.size() + src->IdxBuffer.size());
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dl->CmdBuffer.reserve(dl->CmdBuffer.size() + src->CmdBuffer.size());
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dl->_VtxWritePtr = dl->VtxBuffer.Data + vtx_start;
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dl->_IdxWritePtr = dl->IdxBuffer.Data + idx_start;
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const ImDrawVert *vtx_read = src->VtxBuffer.Data;
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const ImDrawIdx *idx_read = src->IdxBuffer.Data;
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for (int i = 0, c = src->VtxBuffer.size(); i < c; ++i) {
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dl->_VtxWritePtr[i].uv = vtx_read[i].uv;
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dl->_VtxWritePtr[i].col = vtx_read[i].col;
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dl->_VtxWritePtr[i].pos = vtx_read[i].pos * scale + origin;
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}
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for (int i = 0, c = src->IdxBuffer.size(); i < c; ++i) {
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dl->_IdxWritePtr[i] = idx_read[i] + vtx_start;
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}
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for (auto cmd : src->CmdBuffer) {
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cmd.IdxOffset += idx_start;
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IM_ASSERT(cmd.VtxOffset == 0);
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cmd.ClipRect.x = cmd.ClipRect.x * scale + origin.x;
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cmd.ClipRect.y = cmd.ClipRect.y * scale + origin.y;
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cmd.ClipRect.z = cmd.ClipRect.z * scale + origin.x;
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cmd.ClipRect.w = cmd.ClipRect.w * scale + origin.y;
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dl->CmdBuffer.push_back(cmd);
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}
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dl->_VtxCurrentIdx += src->VtxBuffer.size();
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dl->_VtxWritePtr = dl->VtxBuffer.Data + dl->VtxBuffer.size();
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dl->_IdxWritePtr = dl->IdxBuffer.Data + dl->IdxBuffer.size();
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}
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struct ContainedContextConfig {
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bool extra_window_wrapper = false;
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ImVec2 size = {0.f, 0.f};
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ImU32 color = IM_COL32_WHITE;
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bool zoom_enabled = true;
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float zoom_min = 0.3f;
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float zoom_max = 2.f;
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float zoom_divisions = 10.f;
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float zoom_smoothness = 5.f;
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float default_zoom = 1.f;
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ImGuiKey reset_zoom_key = ImGuiKey_R;
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ImGuiMouseButton scroll_button = ImGuiMouseButton_Middle;
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};
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class ContainedContext {
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public:
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~ContainedContext();
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ContainedContextConfig &config() { return m_config; }
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void begin();
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void end();
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[[nodiscard]] float scale() const { return m_scale; }
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[[nodiscard]] const ImVec2 &origin() const { return m_origin; }
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[[nodiscard]] bool hovered() const { return m_hovered; }
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[[nodiscard]] const ImVec2 &scroll() const { return m_scroll; }
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ImGuiContext *getRawContext() { return m_ctx; }
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private:
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ContainedContextConfig m_config;
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ImVec2 m_origin;
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ImVec2 m_pos;
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ImGuiContext *m_ctx = nullptr;
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ImGuiContext *m_original_ctx = nullptr;
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bool m_anyWindowHovered = false;
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bool m_anyItemActive = false;
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bool m_hovered = false;
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float m_scale = m_config.default_zoom, m_scaleTarget = m_config.default_zoom;
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ImVec2 m_scroll = {0.f, 0.f}, m_scrollTarget = {0.f, 0.f};
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};
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inline ContainedContext::~ContainedContext() {
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if (m_ctx)
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ImGui::DestroyContext(m_ctx);
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}
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inline void ContainedContext::begin() {
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ImGui::PushID(this);
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ImGui::PushStyleColor(ImGuiCol_ChildBg, m_config.color);
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ImGui::BeginChild("view_port", m_config.size, 0, ImGuiWindowFlags_NoMove);
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ImGui::PopStyleColor();
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// m_size = ImGui::GetWindowSize();
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m_pos = ImGui::GetWindowPos();
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ImVec2 size = ImGui::GetContentRegionAvail();
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m_origin = ImGui::GetCursorScreenPos();
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m_original_ctx = ImGui::GetCurrentContext();
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const ImGuiStyle &orig_style = ImGui::GetStyle();
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if (!m_ctx)
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m_ctx = ImGui::CreateContext(ImGui::GetIO().Fonts);
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ImGui::SetCurrentContext(m_ctx);
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ImGuiStyle &new_style = ImGui::GetStyle();
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new_style = orig_style;
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CopyIOEvents(m_original_ctx, m_ctx, m_origin, m_scale);
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ImGui::GetIO().DisplaySize = size / m_scale;
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ImGui::GetIO().ConfigInputTrickleEventQueue = false;
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ImGui::NewFrame();
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if (!m_config.extra_window_wrapper)
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return;
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ImGui::SetNextWindowPos(ImVec2(0, 0), ImGuiCond_Appearing);
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ImGui::SetNextWindowSize(ImGui::GetMainViewport()->WorkSize);
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ImGui::PushStyleVar(ImGuiStyleVar_WindowPadding, ImVec2(0, 0));
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ImGui::Begin("viewport_container", nullptr,
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ImGuiWindowFlags_NoDecoration | ImGuiWindowFlags_NoBackground |
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ImGuiWindowFlags_NoMove | ImGuiWindowFlags_NoScrollbar |
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ImGuiWindowFlags_NoScrollWithMouse);
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ImGui::PopStyleVar();
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}
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inline void ContainedContext::end() {
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m_anyWindowHovered = ImGui::IsWindowHovered(ImGuiHoveredFlags_AnyWindow);
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if (m_config.extra_window_wrapper && ImGui::IsWindowHovered())
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m_anyWindowHovered = false;
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m_anyItemActive = ImGui::IsAnyItemActive();
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if (m_config.extra_window_wrapper)
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ImGui::End();
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ImGui::Render();
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ImDrawData *draw_data = ImGui::GetDrawData();
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ImGui::SetCurrentContext(m_original_ctx);
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m_original_ctx = nullptr;
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for (int i = 0; i < draw_data->CmdListsCount; ++i)
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AppendDrawData(draw_data->CmdLists[i], m_origin, m_scale);
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m_hovered = ImGui::IsWindowHovered(ImGuiHoveredFlags_ChildWindows) &&
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!m_anyWindowHovered;
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// Zooming
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if (m_config.zoom_enabled && m_hovered && ImGui::GetIO().MouseWheel != 0.f) {
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m_scaleTarget += ImGui::GetIO().MouseWheel / m_config.zoom_divisions;
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m_scaleTarget =
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m_scaleTarget < m_config.zoom_min ? m_config.zoom_min : m_scaleTarget;
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m_scaleTarget =
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m_scaleTarget > m_config.zoom_max ? m_config.zoom_max : m_scaleTarget;
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if (m_config.zoom_smoothness == 0.f) {
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m_scroll += (ImGui::GetMousePos() - m_pos) / m_scaleTarget -
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(ImGui::GetMousePos() - m_pos) / m_scale;
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m_scale = m_scaleTarget;
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}
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}
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if (abs(m_scaleTarget - m_scale) >= 0.015f / m_config.zoom_smoothness) {
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float cs = (m_scaleTarget - m_scale) / m_config.zoom_smoothness;
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m_scroll += (ImGui::GetMousePos() - m_pos) / (m_scale + cs) -
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(ImGui::GetMousePos() - m_pos) / m_scale;
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m_scale += (m_scaleTarget - m_scale) / m_config.zoom_smoothness;
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if (abs(m_scaleTarget - m_scale) < 0.015f / m_config.zoom_smoothness) {
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m_scroll += (ImGui::GetMousePos() - m_pos) / m_scaleTarget -
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(ImGui::GetMousePos() - m_pos) / m_scale;
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m_scale = m_scaleTarget;
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}
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}
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// Zoom reset
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if (ImGui::IsKeyPressed(m_config.reset_zoom_key, false))
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m_scaleTarget = m_config.default_zoom;
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// Scrolling
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if (m_hovered && !m_anyItemActive &&
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ImGui::IsMouseDragging(m_config.scroll_button, 0.f)) {
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m_scroll += ImGui::GetIO().MouseDelta / m_scale;
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m_scrollTarget = m_scroll;
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}
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ImGui::EndChild();
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ImGui::PopID();
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}
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