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Demo: Improved popups demo and comments.
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106
imgui_demo.cpp
106
imgui_demo.cpp
@ -3192,46 +3192,84 @@ static void ShowDemoWindowPopups()
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if (ImGui::TreeNode("Context menus"))
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{
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HelpMarker("\"Context\" functions are simple helpers to associate a Popup to a given Item or Window identifier.");
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// BeginPopupContextItem() is a helper to provide common/simple popup behavior of essentially doing:
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// if (IsItemHovered() && IsMouseReleased(ImGuiMouseButton_Right))
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// OpenPopup(id);
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// return BeginPopup(id);
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// For more advanced uses you may want to replicate and customize this code.
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// See details in BeginPopupContextItem().
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static float value = 0.5f;
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ImGui::Text("Value = %.3f (<-- right-click here)", value);
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if (ImGui::BeginPopupContextItem("item context menu"))
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// if (id == 0)
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// id = GetItemID(); // Use last item id
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// if (IsItemHovered() && IsMouseReleased(ImGuiMouseButton_Right))
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// OpenPopup(id);
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// return BeginPopup(id);
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// For advanced advanced uses you may want to replicate and customize this code.
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// See more details in BeginPopupContextItem().
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// Example 1
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// When used after an item that has an ID (e.g. Button), we can skip providing an ID to BeginPopupContextItem(),
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// and BeginPopupContextItem() will use the last item ID as the popup ID.
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{
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if (ImGui::Selectable("Set to zero")) value = 0.0f;
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if (ImGui::Selectable("Set to PI")) value = 3.1415f;
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ImGui::SetNextItemWidth(-FLT_MIN);
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ImGui::DragFloat("##Value", &value, 0.1f, 0.0f, 0.0f);
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ImGui::EndPopup();
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const char* names[5] = { "Label1", "Label2", "Label3", "Label4", "Label5" };
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for (int n = 0; n < 5; n++)
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{
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ImGui::Selectable(names[n]);
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if (ImGui::BeginPopupContextItem()) // <-- use last item id as popup id
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{
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ImGui::Text("This a popup for \"%s\"!", names[n]);
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if (ImGui::Button("Close"))
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ImGui::CloseCurrentPopup();
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ImGui::EndPopup();
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}
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if (ImGui::IsItemHovered())
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ImGui::SetTooltip("Right-click to open popup");
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}
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}
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// We can also use OpenPopupOnItemClick() which is the same as BeginPopupContextItem() but without the
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// Begin() call. So here we will make it that clicking on the text field with the right mouse button (1)
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// will toggle the visibility of the popup above.
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ImGui::Text("(You can also right-click me to open the same popup as above.)");
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ImGui::OpenPopupOnItemClick("item context menu", 1);
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// When used after an item that has an ID (e.g.Button), we can skip providing an ID to BeginPopupContextItem().
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// BeginPopupContextItem() will use the last item ID as the popup ID.
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// In addition here, we want to include your editable label inside the button label.
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// We use the ### operator to override the ID (read FAQ about ID for details)
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static char name[32] = "Label1";
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char buf[64];
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sprintf(buf, "Button: %s###Button", name); // ### operator override ID ignoring the preceding label
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ImGui::Button(buf);
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if (ImGui::BeginPopupContextItem())
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// Example 2
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// Popup on a Text() element which doesn't have an identifier: we need to provide an identifier to BeginPopupContextItem().
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// Using an explicit identifier is also convenient if you want to activate the popups from different locations.
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{
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ImGui::Text("Edit name:");
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ImGui::InputText("##edit", name, IM_ARRAYSIZE(name));
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if (ImGui::Button("Close"))
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ImGui::CloseCurrentPopup();
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ImGui::EndPopup();
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HelpMarker("Text() elements don't have stable identifiers so we need to provide one.");
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static float value = 0.5f;
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ImGui::Text("Value = %.3f <-- (1) right-click this value", value);
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if (ImGui::BeginPopupContextItem("my popup"))
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{
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if (ImGui::Selectable("Set to zero")) value = 0.0f;
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if (ImGui::Selectable("Set to PI")) value = 3.1415f;
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ImGui::SetNextItemWidth(-FLT_MIN);
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ImGui::DragFloat("##Value", &value, 0.1f, 0.0f, 0.0f);
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ImGui::EndPopup();
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}
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// We can also use OpenPopupOnItemClick() to toggle the visibility of a given popup.
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// Here we make it that right-clicking this other text element opens the same popup as above.
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// The popup itself will be submitted by the code above.
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ImGui::Text("(2) Or right-click this text");
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ImGui::OpenPopupOnItemClick("my popup", ImGuiPopupFlags_MouseButtonRight);
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// Back to square one: manually open the same popup.
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if (ImGui::Button("(3) Or click this button"))
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ImGui::OpenPopup("my popup");
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}
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// Example 3
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// When using BeginPopupContextItem() with an implicit identifier (NULL == use last item ID),
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// we need to make sure your item identifier is stable.
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// In this example we showcase altering the item label while preserving its identifier, using the ### operator (see FAQ).
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{
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HelpMarker("Showcase using a popup ID linked to item ID, with the item having a changing label + stable ID using the ### operator.");
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static char name[32] = "Label1";
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char buf[64];
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sprintf(buf, "Button: %s###Button", name); // ### operator override ID ignoring the preceding label
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ImGui::Button(buf);
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if (ImGui::BeginPopupContextItem())
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{
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ImGui::Text("Edit name:");
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ImGui::InputText("##edit", name, IM_ARRAYSIZE(name));
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if (ImGui::Button("Close"))
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ImGui::CloseCurrentPopup();
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ImGui::EndPopup();
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}
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ImGui::SameLine(); ImGui::Text("(<-- right-click here)");
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}
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ImGui::SameLine(); ImGui::Text("(<-- right-click here)");
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ImGui::TreePop();
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}
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