1 files changed, 116 insertions, 8 deletions

diff --git a/include/ui.h b/include/ui.h
index 43bb2e7..8570552 100644
--- a/include/ui.h
+++ b/include/ui.h
@@ -36,6 +36,9 @@ typedef struct uiPoint {
   int y;
 } uiPoint;
 
+/// Widget ID.
+typedef int uiWidgetId;
+
 /// Widget type.
 typedef enum uiWidgetType {
   uiTypeButton,
@@ -52,7 +55,7 @@ typedef struct uiTable  uiTable;
 typedef struct uiWidget uiWidget;
 
 /// Widget pointer.
-typedef struct uiWidgetPtr {
+typedef struct uiPtr {
   uiWidgetType type;
   union {
     uiButton* button;
@@ -61,7 +64,77 @@ typedef struct uiWidgetPtr {
     uiTable*  table;
     uiWidget* widget;
   };
-} uiWidgetPtr;
+} uiPtr;
+
+/// Mouse button.
+typedef enum uiMouseButton {
+  uiLMB,
+  uiRMB,
+  uiMouseButtonMax,
+} uiMouseButton;
+
+/// Mouse button state.
+typedef enum uiMouseButtonState {
+  uiMouseUp,
+  uiMouseDown,
+} uiMouseButtonState;
+
+/// Mouse button event.
+typedef struct uiMouseButtonEvent {
+  uiMouseButton      button;
+  uiMouseButtonState state;
+  uiPoint            mouse_position;
+} uiMouseButtonEvent;
+
+/// Mouse click event.
+typedef struct uiMouseClickEvent {
+  uiMouseButton button;
+  uiPoint       mouse_position;
+} uiMouseClickEvent;
+
+/// Mouse scroll event.
+typedef struct uiMouseScrollEvent {
+  uiPoint mouse_position;
+  int     scroll_offset; /// Positive = down; negative = up.
+} uiMouseScrollEvent;
+
+/// Input event type.
+typedef enum uiInputEventType {
+  uiEventMouseButton,
+  uiEventMouseClick,
+  uiEventMouseScroll,
+} uiInputEventType;
+
+/// Input event.
+typedef struct uiInputEvent {
+  uiInputEventType type;
+  union {
+    uiMouseButtonEvent mouse_button;
+    uiMouseClickEvent  mouse_click;
+    uiMouseScrollEvent mouse_scroll;
+  };
+} uiInputEvent;
+
+/// Table click event.
+typedef struct uiTableClickEvent {
+  int col;
+  int row;
+} uiTableClickEvent;
+
+/// UI event type.
+typedef enum uiWidgetEventType {
+  uiWidgetEventClick,
+} uiWidgetEventType;
+
+/// UI event.
+/// These are events from the UI widgets back to the client application.
+typedef struct uiWidgetEvent {
+  uiWidgetEventType type;
+  uiPtr             widget;
+  union {
+    uiTableClickEvent table_click;
+  };
+} uiWidgetEvent;
 
 // -----------------------------------------------------------------------------
 // Library.
@@ -75,14 +148,24 @@ bool uiInit(void);
 void uiShutdown(void);
 
 // -----------------------------------------------------------------------------
+// Widget pointers.
+
+uiPtr uiMakeButtonPtr(uiButton*);
+uiPtr uiMakeFramePtr(uiFrame*);
+uiPtr uiMakeLabelPtr(uiLabel*);
+uiPtr uiMakeTablePtr(uiTable*);
+
+uiButton* uiGetButtonPtr(uiPtr ptr);
+uiFrame*  uiGetFramePtr(uiPtr ptr);
+uiLabel*  uiGetLabelPtr(uiPtr ptr);
+uiTable*  uiGetTablePtr(uiPtr ptr);
+
+// -----------------------------------------------------------------------------
 // Widget.
 
-uiWidgetPtr uiMakeButtonPtr(uiButton*);
-uiWidgetPtr uiMakeFramePtr(uiFrame*);
-uiWidgetPtr uiMakeLabelPtr(uiLabel*);
-uiWidgetPtr uiMakeTablePtr(uiTable*);
+uiWidgetType uiWidgetGetType(const uiWidget*);
 
-void uiWidgetSetParent(uiWidgetPtr child, uiWidgetPtr parent);
+void uiWidgetSetParent(uiPtr child, uiPtr parent);
 
 // -----------------------------------------------------------------------------
 // Button.
@@ -111,17 +194,24 @@ uiSize uiGetFrameSize(const uiFrame*);
 /// Create a label.
 uiLabel* uiMakeLabel(const char* text);
 
+/// Return the label's text.
+const char* uiLabelGetText(const uiLabel*);
+
 // -----------------------------------------------------------------------------
 // Table.
 
 /// Create a table.
 uiTable* uiMakeTable(int rows, int cols, const char** header);
 
+/// Clear the table.
+/// This clears the contents, but not the header.
+void uiTableClear(uiTable*);
+
 /// Add a row.
 void uiTableAddRow(uiTable*, const char** row);
 
 /// Set the table's cell.
-void uiTableSet(uiTable*, int row, int col, uiWidgetPtr widget);
+void uiTableSet(uiTable*, int row, int col, uiPtr widget);
 
 /// Get the table's cell.
 const uiWidget* uiTableGet(const uiTable*, int row, int col);
@@ -134,3 +224,21 @@ uiWidget* uiTableGetMut(uiTable*, int row, int col);
 
 /// Render the frame.
 void uiRender(const uiFrame*, uiSurface*);
+
+// -----------------------------------------------------------------------------
+// UI Events.
+
+/// Get the widget events.
+/// Return the number of events in the returned array.
+///
+/// This function clears the events recorded by the UI library since the last
+/// input event. Subsequent calls to this function, with no further user input,
+/// therefore report zero widget events.
+int uiGetEvents(uiWidgetEvent const**);
+
+// -----------------------------------------------------------------------------
+// User input.
+
+/// Send an input event to the UI.
+/// Return true if the UI requires a redraw.
+bool uiSendEvent(uiFrame*, const uiInputEvent*);