1 package tview 2 3 import "github.com/gdamore/tcell/v2" 4 5 // Primitive is the top-most interface for all graphical primitives. 6 type Primitive interface { 7 // Draw draws this primitive onto the screen. Implementers can call the 8 // screen's ShowCursor() function but should only do so when they have focus. 9 // (They will need to keep track of this themselves.) 10 Draw(screen tcell.Screen) 11 12 // GetRect returns the current position of the primitive, x, y, width, and 13 // height. 14 GetRect() (int, int, int, int) 15 16 // SetRect sets a new position of the primitive. 17 SetRect(x, y, width, height int) 18 19 // InputHandler returns a handler which receives key events when it has focus. 20 // It is called by the Application class. 21 // 22 // A value of nil may also be returned, in which case this primitive cannot 23 // receive focus and will not process any key events. 24 // 25 // The handler will receive the key event and a function that allows it to 26 // set the focus to a different primitive, so that future key events are sent 27 // to that primitive. 28 // 29 // The Application's Draw() function will be called automatically after the 30 // handler returns. 31 // 32 // The Box class provides functionality to intercept keyboard input. If you 33 // subclass from Box, it is recommended that you wrap your handler using 34 // Box.WrapInputHandler() so you inherit that functionality. 35 InputHandler() func(event *tcell.EventKey, setFocus func(p Primitive)) 36 37 // Focus is called by the application when the primitive receives focus. 38 // Implementers may call delegate() to pass the focus on to another primitive. 39 Focus(delegate func(p Primitive)) 40 41 // HasFocus determines if the primitive has focus. This function must return 42 // true also if one of this primitive's child elements has focus. 43 HasFocus() bool 44 45 // Blur is called by the application when the primitive loses focus. 46 Blur() 47 48 // MouseHandler returns a handler which receives mouse events. 49 // It is called by the Application class. 50 // 51 // A value of nil may also be returned to stop the downward propagation of 52 // mouse events. 53 // 54 // The Box class provides functionality to intercept mouse events. If you 55 // subclass from Box, it is recommended that you wrap your handler using 56 // Box.WrapMouseHandler() so you inherit that functionality. 57 MouseHandler() func(action MouseAction, event *tcell.EventMouse, setFocus func(p Primitive)) (consumed bool, capture Primitive) 58 } 59