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Add Rapid Plot Legend Item Selection #551

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Add Rapid Plot Legend Item Selection #551

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378bf69
Add Ctrl+Click to select the item and deselect all others, and Shift+…
JunkyoLee Jan 13, 2024
d3572a5
Add Multiple Item Selection in Plot Legends
JunkyoLee Jan 13, 2024
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49 changes: 47 additions & 2 deletions implot.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -670,9 +670,54 @@ bool ShowLegendEntries(ImPlotItemGroup& items, const ImRect& legend_bb, bool hov
? false
: ImGui::ButtonBehavior(button_bb, item->ID, &item_hov, &item_hld);

if (item_clk)
item->Show = !item->Show;
if (item_clk) {
ImGuiIO& IO = ImGui::GetIO();
if (IO.KeyCtrl && IO.KeyShift) {
// select all items
for (int j = 0; j < num_items; ++j) {
ImPlotItem* item_j = items.GetLegendItem(indices[j]);
item_j->Show = true;
}
}
else if (IO.KeyCtrl) {
// select the item and deselect all others
for (int j = 0; j < num_items; ++j) {
ImPlotItem* item_j = items.GetLegendItem(indices[j]);
if (item_j->Show) {
item_j->Show = false;
}
}
item->Show = true;
}
else {
// select/deselect the item
item->Show = !item->Show;
}
}
else {
// multiple selection
static bool selecting_multiple_items = false;

if (item_hov) {
selecting_multiple_items = true;
}

if (ImGui::IsMouseReleased(ImGuiMouseButton_Left)) {
selecting_multiple_items = false;
}

if (selecting_multiple_items &&
ImGui::IsMouseDown(ImGuiMouseButton_Left) &&
ImGui::IsMouseHoveringRect(button_bb.Min, button_bb.Max)) {
ImGuiIO& IO = ImGui::GetIO();
if (IO.KeyCtrl) {
item->Show = true;
}
else if (IO.KeyAlt) {
item->Show = false;
}
}
}

const bool can_hover = (item_hov)
&& (!ImHasFlag(items.Legend.Flags, ImPlotLegendFlags_NoHighlightItem)
Expand Down