mirror of https://github.com/gizak/termui.git
103 lines
2.6 KiB
Go
103 lines
2.6 KiB
Go
// Copyright 2017 Zack Guo <zack.y.guo@gmail.com>. All rights reserved.
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// Use of this source code is governed by a MIT license that can
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// be found in the LICENSE file.
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package termui
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import (
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"image"
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)
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// Block is the base struct inherited by most widgets.
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// Block manages size, position, border, and title.
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// It implements all 3 of the methods needed for the `Drawable` interface.
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// Custom widgets will override the Draw method.
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type Block struct {
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Border bool
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BorderStyle Style
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BorderLeft, BorderRight, BorderTop, BorderBottom bool
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PaddingLeft, PaddingRight, PaddingTop, PaddingBottom int
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image.Rectangle
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Inner image.Rectangle
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Title string
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TitleStyle Style
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}
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func NewBlock() *Block {
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return &Block{
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Border: true,
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BorderStyle: Theme.Block.Border,
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BorderLeft: true,
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BorderRight: true,
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BorderTop: true,
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BorderBottom: true,
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TitleStyle: Theme.Block.Title,
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}
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}
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func (self *Block) drawBorder(buf *Buffer) {
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verticalCell := Cell{VERTICAL_LINE, self.BorderStyle}
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horizontalCell := Cell{HORIZONTAL_LINE, self.BorderStyle}
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// draw lines
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if self.BorderTop {
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buf.Fill(horizontalCell, image.Rect(self.Min.X, self.Min.Y, self.Max.X, self.Min.Y+1))
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}
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if self.BorderBottom {
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buf.Fill(horizontalCell, image.Rect(self.Min.X, self.Max.Y-1, self.Max.X, self.Max.Y))
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}
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if self.BorderLeft {
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buf.Fill(verticalCell, image.Rect(self.Min.X, self.Min.Y, self.Min.X+1, self.Max.Y))
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}
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if self.BorderRight {
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buf.Fill(verticalCell, image.Rect(self.Max.X-1, self.Min.Y, self.Max.X, self.Max.Y))
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}
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// draw corners
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if self.BorderTop && self.BorderLeft {
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buf.SetCell(Cell{TOP_LEFT, self.BorderStyle}, self.Min)
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}
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if self.BorderTop && self.BorderRight {
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buf.SetCell(Cell{TOP_RIGHT, self.BorderStyle}, image.Pt(self.Max.X-1, self.Min.Y))
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}
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if self.BorderBottom && self.BorderLeft {
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buf.SetCell(Cell{BOTTOM_LEFT, self.BorderStyle}, image.Pt(self.Min.X, self.Max.Y-1))
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}
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if self.BorderBottom && self.BorderRight {
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buf.SetCell(Cell{BOTTOM_RIGHT, self.BorderStyle}, self.Max.Sub(image.Pt(1, 1)))
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}
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}
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// Draw implements the Drawable interface.
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func (self *Block) Draw(buf *Buffer) {
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if self.Border {
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self.drawBorder(buf)
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}
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buf.SetString(
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self.Title,
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self.TitleStyle,
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image.Pt(self.Min.X+2, self.Min.Y),
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)
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}
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// SetRect implements the Drawable interface.
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func (self *Block) SetRect(x1, y1, x2, y2 int) {
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self.Rectangle = image.Rect(x1, y1, x2, y2)
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self.Inner = image.Rect(
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self.Min.X+1+self.PaddingLeft,
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self.Min.Y+1+self.PaddingTop,
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self.Max.X-1-self.PaddingRight,
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self.Max.Y-1-self.PaddingBottom,
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)
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}
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// GetRect implements the Drawable interface.
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func (self *Block) GetRect() image.Rectangle {
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return self.Rectangle
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}
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