Add the ability to move filters up and down

fragments/filters.cpp

@@ -1,6 +1,7 @@
 #include <imgui/imgui.h>
 #include <imgui/misc/cpp/imgui_stdlib.h>
 
+#include "../misc.h"
 #include "../group_panel.h"
 #include "../filters.h"
 #include "ok_buttons_fragment.h"
@@ -13,7 +14,8 @@ static inline void render_priority_filter(PriorityFilter* filter);
 static inline void render_group_filter(GroupFilter* filter);
 static std::unique_ptr<Filter> render_add_filter_popup();
 
-static void render_filter(Filter* filter, std::string* title, bool* request_removal) {
+static void render_filter(Filter* filter, std::string* title, bool* request_removal,
+        auto move_up, auto move_down, bool can_move_up, bool can_move_down) {
     ImGui::PushID(filter);
     ImGui::BeginGroupPanel();
 
@@ -42,6 +44,15 @@ static void render_filter(Filter* filter, std::string* title, bool* request_remo
         *request_removal = true;
     }
 
+    ImGui::SameLine();
+    if (ImGui::ArrowButton("##up", ImGuiDir_Up, can_move_up)) {
+        move_up();
+    }
+    ImGui::SameLine();
+    if (ImGui::ArrowButton("##down", ImGuiDir_Down, can_move_down)) {
+        move_down();
+    }
+
     {
         ImGui::SameLine();
         bool disabled = filter->disabled();
@@ -162,16 +173,28 @@ static inline void render_group_filter(GroupFilter* filter) {
         filter->type = static_cast<GroupFilter::Type>(selected_type);
     }
 
-    for (std::vector<std::unique_ptr<Filter>>::iterator it = filter->filters.begin(); it != filter->filters.end();) {
+    std::vector<std::pair<size_t, size_t>> swaps_to_do;
+    std::vector<size_t> removals_to_do;
+    for (size_t i = 0; i < filter->filters.size(); i++) {
         bool removal_requested = false;
-        render_filter(it->get(), nullptr, &removal_requested);
+        render_filter(filter->filters[i].get(), nullptr, &removal_requested, [&]() {
+            swaps_to_do.push_back(std::make_pair(i, i - 1));
+        }, [&]() {
+            swaps_to_do.push_back(std::make_pair(i, i + 1));
+        }, i != 0, i + 1 != filter->filters.size());
+
         if (removal_requested) {
-            filter->filters.erase(it);
+            removals_to_do.push_back(i);
-            filter->updated();
-        } else {
-            it++;
         }
     }
+    for (auto &[lhs, rhs] : swaps_to_do) {
+        std::swap(filter->filters[lhs], filter->filters[rhs]);
+        filter->updated();
+    }
+    for (size_t i : removals_to_do) {
+        filter->filters.erase(filter->filters.begin() + static_cast<ssize_t>(i));
+        filter->updated();
+    }
 
     if (ImGui::Button("+ add filter")) {
         ImGui::OpenPopup("add_filter");
@@ -212,15 +235,26 @@ void filters_fragment(Filters& inactive_filters) {
     ImGui::TextWrapped("You can use regex for strings by prepending \"regex:\". "
         "While editing titles, press Enter to use the new title or press Escape to keep the old one");
 
-    for (Filters::iterator it = inactive_filters.begin(); it != inactive_filters.end();) {
+    std::vector<std::pair<size_t, size_t>> swaps_to_do;
+    std::vector<size_t> removals_to_do;
+    for (size_t i = 0; i < inactive_filters.size(); i++) {
         bool removal_requested = false;
-        render_filter(it->second.get(), &it->first, &removal_requested);
+        render_filter(inactive_filters[i].second.get(), &inactive_filters[i].first, &removal_requested, [&]() {
+            swaps_to_do.push_back(std::make_pair(i, i - 1));
+        }, [&]() {
+            swaps_to_do.push_back(std::make_pair(i, i + 1));
+        }, i != 0, i + 1 != inactive_filters.size());
+
         if (removal_requested) {
-            inactive_filters.erase(it);
+            removals_to_do.push_back(i);
-        } else {
-            it++;
         }
     }
+    for (auto &[lhs, rhs] : swaps_to_do) {
+        std::swap(inactive_filters[lhs], inactive_filters[rhs]);
+    }
+    for (size_t i : removals_to_do) {
+        inactive_filters.erase(inactive_filters.begin() + static_cast<ssize_t>(i));
+    }
 
     if (ImGui::Button("+ add filter")) {
         ImGui::OpenPopup("add_filter");

misc.cpp

@@ -62,6 +62,19 @@ bool ImGui::Button(const char* label, bool enabled) {
     return res;
 }
 
+bool ImGui::ArrowButton(const char* label, ImGuiDir dir, bool enabled) {
+    if (!enabled) {
+        ImGui::BeginDisabled();
+    }
+
+    bool res = ImGui::ArrowButton(label, dir);
+
+    if (!enabled) {
+        ImGui::EndDisabled();
+    }
+    return res;
+}
+
 bool ImGui::BeginWithCloseShortcut(const char* label, bool* p_open, ImGuiWindowFlags flags) {
     bool res = ImGui::Begin(label, p_open, flags);
 

misc.h

@@ -3,6 +3,7 @@
 #include <string>
 typedef int ImGuiWindowFlags; // forward declaration from imgui/imgui.h
 typedef int ImGuiKeyChord; // forward declaration from imgui/imgui.h
+typedef int ImGuiDir; // forward declaration from imgui/imgui.h
 
 std::string quote(const std::string& str);
 void throw_system_error(int err, const char* what);
@@ -13,6 +14,7 @@ namespace ImGui {
     void TextUnformatted(const std::string& str);
     bool RedButton(const char* label);
     bool Button(const char* label, bool enabled);
+    bool ArrowButton(const char* label, ImGuiDir dir, bool enabled);
     bool BeginWithCloseShortcut(const char* label, bool* p_open, ImGuiWindowFlags flags = 0);
     // don't spill __all__ of imgui_internal.h
     bool IsKeyPressed(ImGuiKeyChord key_chord, bool repeat = true);