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[Example] Add example of Drag & Drop
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3 files changed

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‎example/src/main/java/ExampleDragAndDrop.java‎

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import imgui.ImGui;
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import imgui.flag.ImGuiDragDropFlags;
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import imgui.flag.ImGuiInputTextFlags;
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import imgui.flag.ImGuiWindowFlags;
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import imgui.type.ImBoolean;
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import imgui.type.ImInt;
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import imgui.type.ImString;
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import java.util.concurrent.atomic.AtomicInteger;
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public class ExampleDragAndDrop {
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private static final String PAYLOAD_TYPE = "PAYLOAD";
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private static final StringPayload STRING_PAYLOAD = new StringPayload();
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private static final IntegerPayload INTEGER_PAYLOAD = new IntegerPayload();
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private static final AtomicInteger CLASS_SPECIFIC_PAYLOAD = new AtomicInteger(23);
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private static String data = "No Data...";
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public static void show(final ImBoolean showDragNDropWindow) {
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if (ImGui.begin("Drag'N'Drop Demo", showDragNDropWindow, ImGuiWindowFlags.AlwaysAutoResize)) {
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ImGui.text("Drag from here:");
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ImGui.inputText("String payload", STRING_PAYLOAD.input, ImGuiInputTextFlags.CallbackResize);
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setupPayload(STRING_PAYLOAD);
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ImGui.inputInt("Integer payload", INTEGER_PAYLOAD.input);
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setupPayload(INTEGER_PAYLOAD);
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ImGui.button("Class specific payload");
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setupClassSpecificPayload();
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ImGui.separator();
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ImGui.text("Drop here any:");
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ImGui.button(data, 100, 50);
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setupTarget();
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ImGui.separator();
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ImGui.text("Drop here string payload only");
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ImGui.button(data, 100, 50);
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setupStringPayloadTarget();
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ImGui.separator();
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ImGui.text("Drop here class specific payload only");
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ImGui.button(data, 100, 50);
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setupClassSpecificPayloadTarget();
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}
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ImGui.end();
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}
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private static void setupPayload(final Payload<?> payload) {
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if (ImGui.beginDragDropSource(ImGuiDragDropFlags.SourceAllowNullID)) {
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ImGui.setDragDropPayload(PAYLOAD_TYPE, payload);
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ImGui.text("Dragging: " + payload.getData());
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ImGui.endDragDropSource();
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}
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}
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private static void setupClassSpecificPayload() {
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if (ImGui.beginDragDropSource()) {
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ImGui.setDragDropPayload(CLASS_SPECIFIC_PAYLOAD);
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ImGui.text("Dragging class specific payload");
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ImGui.endDragDropSource();
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}
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}
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private static void setupTarget() {
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if (ImGui.beginDragDropTarget()) {
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Payload<?> payload = ImGui.acceptDragDropPayload(PAYLOAD_TYPE);
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if (payload != null) {
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data = String.valueOf(payload.getData());
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}
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ImGui.endDragDropTarget();
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}
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}
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/**
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* Type safe example. ImGui will show that it can accept payload, but payload itself will be null.
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*/
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private static void setupStringPayloadTarget() {
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if (ImGui.beginDragDropTarget()) {
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StringPayload payload = ImGui.acceptDragDropPayload(PAYLOAD_TYPE, StringPayload.class);
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if (payload != null) {
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data = payload.getData();
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}
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ImGui.endDragDropTarget();
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}
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}
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/**
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* Class specific example. We can bind our payload to a specific class, so it will be 100% type safe.
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*/
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private static void setupClassSpecificPayloadTarget() {
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if (ImGui.beginDragDropTarget()) {
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AtomicInteger payload = ImGui.acceptDragDropPayload(AtomicInteger.class);
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if (payload != null) {
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data = String.valueOf(payload.get());
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}
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ImGui.endDragDropTarget();
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}
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}
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private interface Payload<T> {
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T getData();
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}
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private static final class StringPayload implements Payload<String> {
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ImString input = new ImString("You can drag inputs as well");
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@Override
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public String getData() {
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return input.get();
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}
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}
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private static final class IntegerPayload implements Payload<Integer> {
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ImInt input = new ImInt();
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@Override
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public Integer getData() {
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return input.get();
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}
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}
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}

‎example/src/main/java/Extra.java‎

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@@ -6,6 +6,7 @@ public class Extra {
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private static final ImBoolean SHOW_DEMO_WINDOW = new ImBoolean(false);
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private static final ImBoolean SHOW_IMNODES_DEMO_WINDOW = new ImBoolean(false);
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private static final ImBoolean SHOW_IMGUI_NODE_EDITOR_DEMO_WINDOW = new ImBoolean(false);
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private static final ImBoolean SHOW_DRAG_N_DROP_WINDOW = new ImBoolean(false);
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private static final Graph GRAPH = new Graph();
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@@ -14,6 +15,7 @@ public static void show(final Application app) {
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ImGui.checkbox("Show Demo Window", SHOW_DEMO_WINDOW);
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ImGui.checkbox("Show ImNodes Demo Window", SHOW_IMNODES_DEMO_WINDOW);
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ImGui.checkbox("Show imgui-node-editor Demo Window", SHOW_IMGUI_NODE_EDITOR_DEMO_WINDOW);
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ImGui.checkbox("Show Drag'N'Drop Demo Window", SHOW_DRAG_N_DROP_WINDOW);
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if (SHOW_DEMO_WINDOW.get()) {
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ImGui.showDemoWindow(SHOW_DEMO_WINDOW);
@@ -26,5 +28,9 @@ public static void show(final Application app) {
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if (SHOW_IMGUI_NODE_EDITOR_DEMO_WINDOW.get()) {
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ExampleImGuiNodeEditor.show(SHOW_IMGUI_NODE_EDITOR_DEMO_WINDOW, GRAPH);
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}
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if (SHOW_DRAG_N_DROP_WINDOW.get()) {
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ExampleDragAndDrop.show(SHOW_DRAG_N_DROP_WINDOW);
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}
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}
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}

‎imgui-binding/src/main/java/imgui/ImGui.java‎

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@@ -1,5 +1,6 @@
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package imgui;
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import imgui.flag.ImGuiCond;
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import imgui.flag.ImGuiDragDropFlags;
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import imgui.flag.ImGuiInputTextFlags;
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import imgui.type.ImBoolean;
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* Binding stores a reference to the object in a form of {@link WeakReference}.
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*/
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public static boolean setDragDropPayload(final String dataType, final Object payload) {
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return setDragDropPayload(dataType, payload, ImGuiDragDropFlags.None);
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return setDragDropPayload(dataType, payload, ImGuiCond.None);
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}
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/**
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}
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/**
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* Binding alternative for {@link #setDragDropPayload(String, Object)}, but uses payload class as a unique identifier.
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* Binding alternative for {@link #setDragDropPayload(String, Object)}, which uses payload class as a unique identifier.
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*/
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public static boolean setDragDropPayload(final Object payload) {
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return setDragDropPayload(payload, ImGuiDragDropFlags.None);
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return setDragDropPayload(payload, ImGuiCond.None);
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}
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/**
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* Binding alternative for {@link #setDragDropPayload(String, Object, int)}, but uses payload class as a unique identifier.
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* Binding alternative for {@link #setDragDropPayload(String, Object, int)}, which uses payload class as a unique identifier.
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*/
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public static boolean setDragDropPayload(final Object payload, final int imGuiCond) {
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return setDragDropPayload(String.valueOf(payload.getClass().hashCode()), payload, imGuiCond);
@@ -4955,14 +4956,14 @@ public static <T> T acceptDragDropPayload(final String dataType, final int imGui
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}
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/**
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* Binding alternative for {@link #acceptDragDropPayload(String)}, but uses payload class as a unique identifier.
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* Binding alternative for {@link #acceptDragDropPayload(String)}, which uses payload class as a unique identifier.
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*/
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public static <T> T acceptDragDropPayload(final Class<T> aClass) {
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return acceptDragDropPayload(String.valueOf(aClass.hashCode()), ImGuiDragDropFlags.None, aClass);
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}
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/**
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* Binding alternative for {@link #acceptDragDropPayload(String, int)}, but uses payload class as a unique identifier.
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* Binding alternative for {@link #acceptDragDropPayload(String, int)}, which uses payload class as a unique identifier.
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*/
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public static <T> T acceptDragDropPayload(final Class<T> aClass, final int imGuiDragDropFlags) {
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return acceptDragDropPayload(String.valueOf(aClass.hashCode()), imGuiDragDropFlags, aClass);
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}
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/**
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* Binding alternative for {@link #getDragDropPayload(String)}, but uses payload class as a unique identifier.
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* Binding alternative for {@link #getDragDropPayload(String)}, which uses payload class as a unique identifier.
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*/
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public static <T> T getDragDropPayload(final Class<T> aClass) {
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return getDragDropPayload(String.valueOf(aClass.hashCode()));

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