Flexbox for OPTIQ

CMakeLists.txt

@@ -106,6 +106,7 @@ set(VIEW_FILES
     src/view/src/rocprofvis_minimap.cpp
     src/view/src/widgets/rocprofvis_widget.cpp
     src/view/src/widgets/rocprofvis_split_containers.cpp
+    src/view/src/widgets/rocprofvis_flex_container.cpp
     src/view/src/widgets/rocprofvis_tab_container.cpp
     src/view/src/widgets/rocprofvis_editable_textfield.cpp
     src/view/src/widgets/rocprofvis_debug_window.cpp

src/view/src/widgets/rocprofvis_flex_container.cpp

@@ -0,0 +1,105 @@
+// Copyright Advanced Micro Devices, Inc.
+// SPDX-License-Identifier: MIT
+
+#include "rocprofvis_flex_container.h"
+#include "rocprofvis_settings_manager.h"
+
+#include <algorithm>
+#include <stdexcept>
+#include <imgui.h>
+
+namespace RocProfVis
+{
+namespace View
+{
+
+struct FlexRow
+{
+    size_t start = 0;
+    size_t count = 0;
+    float  min_w = 0.0f;
+    float  grow  = 0.0f;
+};
+
+FlexItem&
+FlexContainer::GetItem(const std::string& id)
+{
+    for(auto& item : items)
+        if(item.id == id) return item;
+    throw std::runtime_error("FlexContainer: item not found: " + id);
+}
+
+void
+FlexContainer::Render()
+{
+    if(items.empty()) return;
+
+    float avail_width  = ImGui::GetContentRegionAvail().x;
+    float avail_height = ImGui::GetContentRegionAvail().y;
+
+    // bin items into rows
+
+    std::vector<FlexRow> rows;
+    rows.push_back({});
+
+    for(size_t i = 0; i < items.size(); i++)
+    {
+        FlexRow& cur  = rows.back();
+        float gap_w   = (cur.count > 0) ? gap : 0.0f;
+        float needed  = cur.min_w + gap_w + items[i].min_width;
+
+        if(cur.count > 0 && needed > avail_width)
+            rows.push_back({i, 0, 0.0f, 0.0f});
+
+        FlexRow& target = rows.back();
+        if(target.count > 0) target.min_w += gap;
+        target.min_w += items[i].min_width;
+        target.grow  += items[i].flex_grow;
+        target.count++;
+    }
+
+    // figure out default row height
+
+    size_t num_rows      = rows.size();
+    float  row_gap_total = gap * static_cast<float>(num_rows > 1 ? num_rows - 1 : 0);
+    float  row_height    = std::max(avail_height, min_row_height);
+    row_height           = (row_height - row_gap_total) / static_cast<float>(num_rows);
+
+    // render
+
+    for(size_t row_index = 0; row_index < num_rows; row_index++)
+    {
+        FlexRow& row       = rows[row_index];
+        float    row_gaps  = gap * static_cast<float>(row.count > 1 ? row.count - 1 : 0);
+        float    min_sum   = row.min_w - row_gaps;
+        float    free      = std::max(0.0f, avail_width - min_sum - row_gaps);
+
+        for(size_t column_index = 0; column_index < row.count; column_index++)
+        {
+            FlexItem& item = items[row.start + column_index];
+
+            float w = item.min_width;
+            if(row.grow > 0.0f)
+                w += free * (item.flex_grow / row.grow);
+
+            float h = (item.height > 0.0f) ? item.height : row_height;
+
+            ImGui::PushStyleColor(ImGuiCol_ChildBg,
+                SettingsManager::GetInstance().GetColor(Colors::kFillerColor));
+
+            ImGui::BeginChild(ImGui::GetID(&item), ImVec2(w, h),
+                              ImGuiChildFlags_Borders);
+            if(item.widget) item.widget->Render();
+            ImGui::EndChild();
+
+            ImGui::PopStyleColor();
+
+            if(column_index + 1 < row.count) ImGui::SameLine(0.0f, gap);
+        }
+
+        if(row_index + 1 < num_rows) ImGui::Dummy(ImVec2(0.0f, gap));
+    }
+}
+
+}  // namespace View
+}  // namespace RocProfVis

src/view/src/widgets/rocprofvis_flex_container.h

@@ -0,0 +1,34 @@
+// Copyright Advanced Micro Devices, Inc.
+// SPDX-License-Identifier: MIT
+
+#pragma once
+
+#include "rocprofvis_widget.h"
+
+namespace RocProfVis
+{
+namespace View
+{
+
+struct FlexItem
+{
+    std::string                id;
+    std::shared_ptr<RocWidget> widget;
+    float                      min_width = 500.0f;
+    float                      height    = 0.0f;
+    float                      flex_grow = 1.0f;
+};
+
+class FlexContainer : public RocWidget
+{
+public:
+    void      Render() override;
+    FlexItem& GetItem(const std::string& id);
+
+    std::vector<FlexItem> items;
+    float                 gap            = 8.0f;
+    float                 min_row_height = 0.0f;
+};
+
+}  // namespace View
+}  // namespace RocProfVis