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572 lines
16 KiB
572 lines
16 KiB
package cview
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import (
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"sync"
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"github.com/gdamore/tcell/v2"
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)
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// Box is the base Primitive for all widgets. It has a background color and
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// optional surrounding elements such as a border and a title. It does not have
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// inner text. Widgets embed Box and draw their text over it.
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type Box struct {
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// The position of the rect.
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x, y, width, height int
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// Padding.
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paddingTop, paddingBottom, paddingLeft, paddingRight int
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// The inner rect reserved for the box's content.
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innerX, innerY, innerWidth, innerHeight int
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// Whether or not the box is visible.
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visible bool
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// The border color when the box has focus.
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borderColorFocused tcell.Color
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// The box's background color.
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backgroundColor tcell.Color
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// Whether or not the box's background is transparent.
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backgroundTransparent bool
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// Whether or not a border is drawn, reducing the box's space for content by
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// two in width and height.
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border bool
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// The color of the border.
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borderColor tcell.Color
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// The style attributes of the border.
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borderAttributes tcell.AttrMask
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// The title. Only visible if there is a border, too.
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title []byte
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// The color of the title.
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titleColor tcell.Color
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// The alignment of the title.
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titleAlign int
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// Provides a way to find out if this box has focus. We always go through
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// this interface because it may be overridden by implementing classes.
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focus Focusable
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// Whether or not this box has focus.
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hasFocus bool
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// Whether or not this box shows its focus.
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showFocus bool
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// An optional capture function which receives a key event and returns the
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// event to be forwarded to the primitive's default input handler (nil if
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// nothing should be forwarded).
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inputCapture func(event *tcell.EventKey) *tcell.EventKey
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// An optional function which is called before the box is drawn.
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draw func(screen tcell.Screen, x, y, width, height int) (int, int, int, int)
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// An optional capture function which receives a mouse event and returns the
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// event to be forwarded to the primitive's default mouse event handler (at
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// least one nil if nothing should be forwarded).
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mouseCapture func(action MouseAction, event *tcell.EventMouse) (MouseAction, *tcell.EventMouse)
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l sync.RWMutex
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}
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// NewBox returns a Box without a border.
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func NewBox() *Box {
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b := &Box{
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width: 15,
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height: 10,
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visible: true,
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backgroundColor: Styles.PrimitiveBackgroundColor,
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borderColor: Styles.BorderColor,
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titleColor: Styles.TitleColor,
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borderColorFocused: ColorUnset,
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titleAlign: AlignCenter,
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showFocus: true,
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}
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b.focus = b
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b.updateInnerRect()
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return b
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}
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func (b *Box) updateInnerRect() {
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x, y, width, height := b.x, b.y, b.width, b.height
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// Subtract border space
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if b.border {
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x++
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y++
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width -= 2
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height -= 2
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}
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// Subtract padding
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x, y, width, height =
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x+b.paddingLeft,
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y+b.paddingTop,
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width-b.paddingLeft-b.paddingRight,
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height-b.paddingTop-b.paddingBottom
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if width < 0 {
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width = 0
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}
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if height < 0 {
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height = 0
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}
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b.innerX, b.innerY, b.innerWidth, b.innerHeight = x, y, width, height
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}
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// GetPadding returns the size of the padding around the box content.
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func (b *Box) GetPadding() (top, bottom, left, right int) {
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b.l.RLock()
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defer b.l.RUnlock()
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return b.paddingTop, b.paddingBottom, b.paddingLeft, b.paddingRight
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}
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// SetPadding sets the size of the padding around the box content.
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func (b *Box) SetPadding(top, bottom, left, right int) {
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b.l.Lock()
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defer b.l.Unlock()
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b.paddingTop, b.paddingBottom, b.paddingLeft, b.paddingRight = top, bottom, left, right
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b.updateInnerRect()
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}
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// GetRect returns the current position of the rectangle, x, y, width, and
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// height.
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func (b *Box) GetRect() (int, int, int, int) {
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b.l.RLock()
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defer b.l.RUnlock()
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return b.x, b.y, b.width, b.height
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}
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// GetInnerRect returns the position of the inner rectangle (x, y, width,
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// height), without the border and without any padding. Width and height values
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// will clamp to 0 and thus never be negative.
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func (b *Box) GetInnerRect() (int, int, int, int) {
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b.l.RLock()
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defer b.l.RUnlock()
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return b.innerX, b.innerY, b.innerWidth, b.innerHeight
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}
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// SetRect sets a new position of the primitive. Note that this has no effect
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// if this primitive is part of a layout (e.g. Flex, Grid) or if it was added
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// like this:
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//
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// application.SetRoot(b, true)
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func (b *Box) SetRect(x, y, width, height int) {
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b.l.Lock()
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defer b.l.Unlock()
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b.x, b.y, b.width, b.height = x, y, width, height
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b.updateInnerRect()
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}
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// SetVisible sets the flag indicating whether or not the box is visible.
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func (b *Box) SetVisible(v bool) {
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b.l.Lock()
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defer b.l.Unlock()
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b.visible = v
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}
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// GetVisible returns a value indicating whether or not the box is visible.
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func (b *Box) GetVisible() bool {
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b.l.RLock()
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defer b.l.RUnlock()
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return b.visible
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}
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// SetDrawFunc sets a callback function which is invoked after the box primitive
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// has been drawn. This allows you to add a more individual style to the box
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// (and all primitives which extend it).
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//
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// The function is provided with the box's dimensions (set via SetRect()). It
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// must return the box's inner dimensions (x, y, width, height) which will be
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// returned by GetInnerRect(), used by descendent primitives to draw their own
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// content.
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func (b *Box) SetDrawFunc(handler func(screen tcell.Screen, x, y, width, height int) (int, int, int, int)) {
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b.l.Lock()
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defer b.l.Unlock()
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b.draw = handler
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}
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// GetDrawFunc returns the callback function which was installed with
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// SetDrawFunc() or nil if no such function has been installed.
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func (b *Box) GetDrawFunc() func(screen tcell.Screen, x, y, width, height int) (int, int, int, int) {
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b.l.RLock()
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defer b.l.RUnlock()
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return b.draw
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}
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// WrapInputHandler wraps an input handler (see InputHandler()) with the
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// functionality to capture input (see SetInputCapture()) before passing it
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// on to the provided (default) input handler.
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//
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// This is only meant to be used by subclassing primitives.
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func (b *Box) WrapInputHandler(inputHandler func(*tcell.EventKey, func(p Primitive))) func(*tcell.EventKey, func(p Primitive)) {
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return func(event *tcell.EventKey, setFocus func(p Primitive)) {
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if b.inputCapture != nil {
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event = b.inputCapture(event)
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}
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if event != nil && inputHandler != nil {
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inputHandler(event, setFocus)
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}
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}
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}
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// InputHandler returns nil.
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func (b *Box) InputHandler() func(event *tcell.EventKey, setFocus func(p Primitive)) {
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b.l.RLock()
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defer b.l.RUnlock()
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return b.WrapInputHandler(nil)
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}
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// SetInputCapture installs a function which captures key events before they are
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// forwarded to the primitive's default key event handler. This function can
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// then choose to forward that key event (or a different one) to the default
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// handler by returning it. If nil is returned, the default handler will not
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// be called.
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//
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// Providing a nil handler will remove a previously existing handler.
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//
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// Note that this function will not have an effect on primitives composed of
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// other primitives, such as Form, Flex, or Grid. Key events are only captured
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// by the primitives that have focus (e.g. InputField) and only one primitive
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// can have focus at a time. Composing primitives such as Form pass the focus on
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// to their contained primitives and thus never receive any key events
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// themselves. Therefore, they cannot intercept key events.
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func (b *Box) SetInputCapture(capture func(event *tcell.EventKey) *tcell.EventKey) {
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b.l.Lock()
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defer b.l.Unlock()
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b.inputCapture = capture
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}
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// GetInputCapture returns the function installed with SetInputCapture() or nil
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// if no such function has been installed.
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func (b *Box) GetInputCapture() func(event *tcell.EventKey) *tcell.EventKey {
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b.l.RLock()
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defer b.l.RUnlock()
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return b.inputCapture
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}
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// WrapMouseHandler wraps a mouse event handler (see MouseHandler()) with the
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// functionality to capture mouse events (see SetMouseCapture()) before passing
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// them on to the provided (default) event handler.
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//
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// This is only meant to be used by subclassing primitives.
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func (b *Box) WrapMouseHandler(mouseHandler func(MouseAction, *tcell.EventMouse, func(p Primitive)) (bool, Primitive)) func(action MouseAction, event *tcell.EventMouse, setFocus func(p Primitive)) (consumed bool, capture Primitive) {
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return func(action MouseAction, event *tcell.EventMouse, setFocus func(p Primitive)) (consumed bool, capture Primitive) {
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if b.mouseCapture != nil {
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action, event = b.mouseCapture(action, event)
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}
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if event != nil && mouseHandler != nil {
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consumed, capture = mouseHandler(action, event, setFocus)
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}
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return
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}
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}
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// MouseHandler returns nil.
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func (b *Box) MouseHandler() func(action MouseAction, event *tcell.EventMouse, setFocus func(p Primitive)) (consumed bool, capture Primitive) {
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return b.WrapMouseHandler(func(action MouseAction, event *tcell.EventMouse, setFocus func(p Primitive)) (consumed bool, capture Primitive) {
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if action == MouseLeftClick && b.InRect(event.Position()) {
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setFocus(b)
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consumed = true
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}
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return
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})
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}
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// SetMouseCapture sets a function which captures mouse events (consisting of
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// the original tcell mouse event and the semantic mouse action) before they are
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// forwarded to the primitive's default mouse event handler. This function can
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// then choose to forward that event (or a different one) by returning it or
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// returning a nil mouse event, in which case the default handler will not be
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// called.
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//
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// Providing a nil handler will remove a previously existing handler.
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func (b *Box) SetMouseCapture(capture func(action MouseAction, event *tcell.EventMouse) (MouseAction, *tcell.EventMouse)) {
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b.mouseCapture = capture
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}
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// InRect returns true if the given coordinate is within the bounds of the box's
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// rectangle.
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func (b *Box) InRect(x, y int) bool {
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rectX, rectY, width, height := b.GetRect()
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return x >= rectX && x < rectX+width && y >= rectY && y < rectY+height
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}
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// GetMouseCapture returns the function installed with SetMouseCapture() or nil
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// if no such function has been installed.
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func (b *Box) GetMouseCapture() func(action MouseAction, event *tcell.EventMouse) (MouseAction, *tcell.EventMouse) {
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return b.mouseCapture
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}
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// SetBackgroundColor sets the box's background color.
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func (b *Box) SetBackgroundColor(color tcell.Color) {
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b.l.Lock()
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defer b.l.Unlock()
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b.backgroundColor = color
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}
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// GetBackgroundColor returns the box's background color.
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func (b *Box) GetBackgroundColor() tcell.Color {
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b.l.RLock()
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defer b.l.RUnlock()
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return b.backgroundColor
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}
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// SetBackgroundTransparent sets the flag indicating whether or not the box's
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// background is transparent. The screen is not cleared before drawing the
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// application. Overlaying transparent widgets directly onto the screen may
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// result in artifacts. To resolve this, add a blank, non-transparent Box to
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// the bottom layer of the interface via Panels, or set a handler via
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// SetBeforeDrawFunc which clears the screen.
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func (b *Box) SetBackgroundTransparent(transparent bool) {
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b.l.Lock()
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defer b.l.Unlock()
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b.backgroundTransparent = transparent
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}
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// GetBorder returns a value indicating whether the box have a border
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// or not.
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func (b *Box) GetBorder() bool {
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b.l.RLock()
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defer b.l.RUnlock()
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return b.border
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}
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// SetBorder sets the flag indicating whether or not the box should have a
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// border.
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func (b *Box) SetBorder(show bool) {
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b.l.Lock()
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defer b.l.Unlock()
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b.border = show
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b.updateInnerRect()
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}
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// SetBorderColor sets the box's border color.
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func (b *Box) SetBorderColor(color tcell.Color) {
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b.l.Lock()
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defer b.l.Unlock()
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b.borderColor = color
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}
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// SetBorderColorFocused sets the box's border color when the box is focused.
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func (b *Box) SetBorderColorFocused(color tcell.Color) {
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b.l.Lock()
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defer b.l.Unlock()
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b.borderColorFocused = color
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}
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// SetBorderAttributes sets the border's style attributes. You can combine
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// different attributes using bitmask operations:
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//
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// box.SetBorderAttributes(tcell.AttrUnderline | tcell.AttrBold)
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func (b *Box) SetBorderAttributes(attr tcell.AttrMask) {
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b.l.Lock()
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defer b.l.Unlock()
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b.borderAttributes = attr
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}
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// SetTitle sets the box's title.
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func (b *Box) SetTitle(title string) {
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b.l.Lock()
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defer b.l.Unlock()
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b.title = []byte(title)
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}
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// GetTitle returns the box's current title.
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func (b *Box) GetTitle() string {
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b.l.RLock()
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defer b.l.RUnlock()
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return string(b.title)
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}
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// SetTitleColor sets the box's title color.
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func (b *Box) SetTitleColor(color tcell.Color) {
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b.l.Lock()
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defer b.l.Unlock()
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b.titleColor = color
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}
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// SetTitleAlign sets the alignment of the title, one of AlignLeft, AlignCenter,
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// or AlignRight.
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func (b *Box) SetTitleAlign(align int) {
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b.l.Lock()
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defer b.l.Unlock()
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b.titleAlign = align
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}
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// Draw draws this primitive onto the screen.
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func (b *Box) Draw(screen tcell.Screen) {
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b.l.Lock()
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defer b.l.Unlock()
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// Don't draw anything if the box is hidden
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if !b.visible {
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return
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}
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// Don't draw anything if there is no space.
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if b.width <= 0 || b.height <= 0 {
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return
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}
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def := tcell.StyleDefault
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// Fill background.
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background := def.Background(b.backgroundColor)
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if !b.backgroundTransparent {
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for y := b.y; y < b.y+b.height; y++ {
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for x := b.x; x < b.x+b.width; x++ {
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screen.SetContent(x, y, ' ', nil, background)
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}
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}
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}
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// Draw border.
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if b.border && b.width >= 2 && b.height >= 2 {
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border := SetAttributes(background.Foreground(b.borderColor), b.borderAttributes)
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var vertical, horizontal, topLeft, topRight, bottomLeft, bottomRight rune
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var hasFocus bool
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if b.focus == b {
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hasFocus = b.hasFocus
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} else {
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hasFocus = b.focus.HasFocus()
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}
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if hasFocus && b.borderColorFocused != ColorUnset {
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border = SetAttributes(background.Foreground(b.borderColorFocused), b.borderAttributes)
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}
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if hasFocus && b.showFocus {
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horizontal = Borders.HorizontalFocus
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vertical = Borders.VerticalFocus
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topLeft = Borders.TopLeftFocus
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topRight = Borders.TopRightFocus
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bottomLeft = Borders.BottomLeftFocus
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bottomRight = Borders.BottomRightFocus
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} else {
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horizontal = Borders.Horizontal
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vertical = Borders.Vertical
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topLeft = Borders.TopLeft
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topRight = Borders.TopRight
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bottomLeft = Borders.BottomLeft
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bottomRight = Borders.BottomRight
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}
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for x := b.x + 1; x < b.x+b.width-1; x++ {
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screen.SetContent(x, b.y, horizontal, nil, border)
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screen.SetContent(x, b.y+b.height-1, horizontal, nil, border)
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}
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for y := b.y + 1; y < b.y+b.height-1; y++ {
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screen.SetContent(b.x, y, vertical, nil, border)
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screen.SetContent(b.x+b.width-1, y, vertical, nil, border)
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}
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screen.SetContent(b.x, b.y, topLeft, nil, border)
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screen.SetContent(b.x+b.width-1, b.y, topRight, nil, border)
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screen.SetContent(b.x, b.y+b.height-1, bottomLeft, nil, border)
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screen.SetContent(b.x+b.width-1, b.y+b.height-1, bottomRight, nil, border)
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// Draw title.
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if len(b.title) > 0 && b.width >= 4 {
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printed, _ := Print(screen, b.title, b.x+1, b.y, b.width-2, b.titleAlign, b.titleColor)
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if len(b.title)-printed > 0 && printed > 0 {
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_, _, style, _ := screen.GetContent(b.x+b.width-2, b.y)
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fg, _, _ := style.Decompose()
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Print(screen, []byte(string(SemigraphicsHorizontalEllipsis)), b.x+b.width-2, b.y, 1, AlignLeft, fg)
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}
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}
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}
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// Call custom draw function.
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if b.draw != nil {
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b.innerX, b.innerY, b.innerWidth, b.innerHeight = b.draw(screen, b.x, b.y, b.width, b.height)
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}
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|
}
|
|
|
|
// ShowFocus sets the flag indicating whether or not the borders of this
|
|
// primitive should change thickness when focused.
|
|
func (b *Box) ShowFocus(showFocus bool) {
|
|
b.l.Lock()
|
|
defer b.l.Unlock()
|
|
|
|
b.showFocus = showFocus
|
|
}
|
|
|
|
// Focus is called when this primitive receives focus.
|
|
func (b *Box) Focus(delegate func(p Primitive)) {
|
|
b.l.Lock()
|
|
defer b.l.Unlock()
|
|
|
|
b.hasFocus = true
|
|
}
|
|
|
|
// Blur is called when this primitive loses focus.
|
|
func (b *Box) Blur() {
|
|
b.l.Lock()
|
|
defer b.l.Unlock()
|
|
|
|
b.hasFocus = false
|
|
}
|
|
|
|
// HasFocus returns whether or not this primitive has focus.
|
|
func (b *Box) HasFocus() bool {
|
|
b.l.RLock()
|
|
defer b.l.RUnlock()
|
|
|
|
return b.hasFocus
|
|
}
|
|
|
|
// GetFocusable returns the item's Focusable.
|
|
func (b *Box) GetFocusable() Focusable {
|
|
b.l.RLock()
|
|
defer b.l.RUnlock()
|
|
|
|
return b.focus
|
|
}
|
|
|
|
// GetBorderPadding returns the size of the padding around the box content.
|
|
//
|
|
// Deprecated: This function is provided for backwards compatibility.
|
|
// Developers should use GetPadding instead.
|
|
func (b *Box) GetBorderPadding() (top, bottom, left, right int) {
|
|
return b.GetPadding()
|
|
}
|
|
|
|
// SetBorderPadding sets the size of the padding around the box content.
|
|
//
|
|
// Deprecated: This function is provided for backwards compatibility.
|
|
// Developers should use SetPadding instead.
|
|
func (b *Box) SetBorderPadding(top, bottom, left, right int) {
|
|
b.SetPadding(top, bottom, left, right)
|
|
}
|