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comp_addons.go
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comp_addons.go
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// Copyright (C) 2013 Andras Belicza. All rights reserved.
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
// Defines optional, additional features components might have.
// These include features only some component has, so it cannot be
// defined in Comp, and not worth making an own component type for these...
// ...not to mention these can be combined arbitrary.
package gwu
import (
"strconv"
)
// HasText interface defines a modifiable text property.
type HasText interface {
// Text returns the text.
Text() string
// SetText sets the text.
SetText(text string)
}
// newHasTextImpl creates a new hasTextImpl
func newHasTextImpl(text string) hasTextImpl {
return hasTextImpl{text}
}
// HasText implementation.
type hasTextImpl struct {
text string // The text
}
func (c *hasTextImpl) Text() string {
return c.text
}
func (c *hasTextImpl) SetText(text string) {
c.text = text
}
// renderText renders the text.
func (c *hasTextImpl) renderText(w Writer) {
w.Writees(c.text)
}
// HasEnabled interface defines an enabled property.
type HasEnabled interface {
// Enabled returns the enabled property.
Enabled() bool
// SetEnabled sets the enabled property.
SetEnabled(enabled bool)
}
// newHasEnabledImpl returns a new hasEnabledImpl.
func newHasEnabledImpl() hasEnabledImpl {
return hasEnabledImpl{true} // Enabled by default
}
// HasEnabled implementation.
type hasEnabledImpl struct {
enabled bool // The enabled property
}
func (c *hasEnabledImpl) Enabled() bool {
return c.enabled
}
func (c *hasEnabledImpl) SetEnabled(enabled bool) {
c.enabled = enabled
}
var strDisabled = []byte(` disabled="disabled"`) // ` disabled="disabled"`
// renderEnabled renders the enabled attribute.
func (c *hasEnabledImpl) renderEnabled(w Writer) {
if !c.enabled {
w.Write(strDisabled)
}
}
// HasURL interface defines a URL string property.
type HasURL interface {
// URL returns the URL string.
URL() string
// SetURL sets the URL string.
SetURL(url string)
}
// newHasURLImpl creates a new hasUrlImpl
func newHasURLImpl(url string) hasURLImpl {
return hasURLImpl{url}
}
// HasURL implementation.
type hasURLImpl struct {
url string // The URL string
}
func (c *hasURLImpl) URL() string {
return c.url
}
func (c *hasURLImpl) SetURL(url string) {
c.url = url
}
// renderURL renders the URL string.
func (c *hasURLImpl) renderURL(attr string, w Writer) {
w.WriteAttr(attr, c.url)
}
// HAlign is the horizontal alignment type.
type HAlign string
// Horizontal alignment constants.
const (
HALeft HAlign = "left" // Horizontal left alignment
HACenter = "center" // Horizontal center alignment
HARight = "right" // Horizontal right alignment
HADefault = "" // Browser default (or inherited) horizontal alignment
)
// VAlign is the vertical alignment type.
type VAlign string
// Vertical alignment constants.
const (
VATop VAlign = "top" // Vertical top alignment
VAMiddle = "middle" // Vertical center alignment
VABottom = "bottom" // Vertical bottom alignment
VADefault = "" // Browser default (or inherited) vertical alignment
)
// HasHVAlign interfaces defines a horizontal and a vertical
// alignment property.
type HasHVAlign interface {
// HAlign returns the horizontal alignment.
HAlign() HAlign
// SetHAlign sets the horizontal alignment.
SetHAlign(halign HAlign)
// VAlign returns the vertical alignment.
VAlign() VAlign
// SetVAlign sets the vertical alignment.
SetVAlign(valign VAlign)
// SetAlign sets both the horizontal and vertical alignments.
SetAlign(halign HAlign, valign VAlign)
}
// HasHVAlign implementation.
type hasHVAlignImpl struct {
halign HAlign // Horizontal alignment
valign VAlign // Vertical alignment
}
// newHasHVAlignImpl creates a new hasHVAlignImpl
func newHasHVAlignImpl(halign HAlign, valign VAlign) hasHVAlignImpl {
return hasHVAlignImpl{halign, valign}
}
func (c *hasHVAlignImpl) HAlign() HAlign {
return c.halign
}
func (c *hasHVAlignImpl) SetHAlign(halign HAlign) {
c.halign = halign
}
func (c *hasHVAlignImpl) VAlign() VAlign {
return c.valign
}
func (c *hasHVAlignImpl) SetVAlign(valign VAlign) {
c.valign = valign
}
func (c *hasHVAlignImpl) SetAlign(halign HAlign, valign VAlign) {
c.halign = halign
c.valign = valign
}
// CellFmt interface defines a cell formatter which can be used to
// format and style the wrapper cells of individual components such as
// child components of a PanelView or a Table.
type CellFmt interface {
// CellFmt allows overriding horizontal and vertical alignment.
HasHVAlign
// Style returns the Style builder of the wrapper cell.
Style() Style
// Attr returns the explicitly set value of the specified HTML attribute.
attr(name string) string
// SetAttr sets the value of the specified HTML attribute.
// Pass an empty string value to delete the attribute.
setAttr(name, value string)
// iAttr returns the explicitly set value of the specified HTML attribute
// as an int.
// -1 is returned if the value is not set explicitly or is not an int.
iAttr(name string) int
// setIAttr sets the value of the specified HTML attribute as an int.
setIAttr(name string, value int)
}
// CellFmt implementation
type cellFmtImpl struct {
hasHVAlignImpl // Has horizontal and vertical alignment implementation
styleImpl *styleImpl // Style builder. Lazily initialized.
attrs map[string]string // Explicitly set HTML attributes for the cell. Lazily initialized.
}
// newCellFmtImpl creates a new cellFmtImpl.
// Default horizontal alignment is HADefult,
// default vertical alignment is VADefault.
func newCellFmtImpl() *cellFmtImpl {
// Initialize hasHVAlignImpl with HADefault and VADefault
// so if aligns are not changed, they will not be rendered =>
// they will be inherited (from TR).
return &cellFmtImpl{hasHVAlignImpl: newHasHVAlignImpl(HADefault, VADefault)}
}
func (c *cellFmtImpl) Style() Style {
if c.styleImpl == nil {
c.styleImpl = newStyleImpl()
}
return c.styleImpl
}
func (c *cellFmtImpl) attr(name string) string {
return c.attrs[name]
}
func (c *cellFmtImpl) setAttr(name, value string) {
if c.attrs == nil {
c.attrs = make(map[string]string, 2)
}
if len(value) > 0 {
c.attrs[name] = value
} else {
delete(c.attrs, name)
}
}
func (c *cellFmtImpl) iAttr(name string) int {
if value, err := strconv.Atoi(c.attr(name)); err == nil {
return value
}
return -1
}
func (c *cellFmtImpl) setIAttr(name string, value int) {
c.setAttr(name, strconv.Itoa(value))
}
// render renders the formatted HTML tag for the specified tag name.
// tag must start with a less than sign, e.g. "<td".
func (c *cellFmtImpl) render(tag []byte, w Writer) {
c.renderWithAligns(tag, c.halign, c.valign, w)
}
var strVAlign = []byte("vertical-align:") // "vertical-align:"
// render renders the formatted HTML tag for the specified tag name
// using the specified alignments instead of ours.
// tag must start with a less than sign, e.g. "<td".
func (c *cellFmtImpl) renderWithAligns(tag []byte, halign HAlign, valign VAlign, w Writer) {
w.Write(tag)
for name, value := range c.attrs {
w.WriteAttr(name, value)
}
if halign != HADefault {
w.Write(strAlign)
w.Writes(string(halign))
w.Write(strQuote)
}
if c.styleImpl != nil {
c.styleImpl.renderClasses(w)
}
if valign != VADefault || c.styleImpl != nil {
w.Write(strStyle)
if valign != VADefault {
w.Write(strVAlign)
w.Writes(string(valign))
w.Write(strSemicol)
}
if c.styleImpl != nil {
c.styleImpl.renderAttrs(w)
}
w.Write(strQuote)
}
w.Write(strGT)
}
// TableView interface defines a component which is rendered into a table.
type TableView interface {
// TableView is a Container.
Container
// Border returns the border width of the table.
Border() int
// SetBorder sets the border width of the table.
SetBorder(width int)
// TableView has horizontal and vertical alignment.
// This is the default horizontal and vertical alignment for
// all children inside their enclosing cells.
HasHVAlign
// CellSpacing returns the cell spacing.
CellSpacing() int
// SetCellSpacing sets the cell spacing.
// Has no effect if layout is LayoutNatural.
SetCellSpacing(spacing int)
// CellPadding returns the cell spacing.
CellPadding() int
// SetCellPadding sets the cell padding.
// Has no effect if layout is LayoutNatural.
SetCellPadding(padding int)
}
// TableView implementation.
type tableViewImpl struct {
compImpl // component implementation
hasHVAlignImpl // Has horizontal and vertical alignment implementation
}
// newTableViewImpl creates a new tableViewImpl.
// Default horizontal alignment is HADefault,
// default vertical alignment is VADefault.
func newTableViewImpl() tableViewImpl {
// Initialize hasHVAlignImpl with HADefault and VADefault
// so if aligns are not changed, they will not be rendered =>
// they will be inherited (from TR).
c := tableViewImpl{compImpl: newCompImpl(nil), hasHVAlignImpl: newHasHVAlignImpl(HADefault, VADefault)}
c.SetCellSpacing(0)
c.SetCellPadding(0)
return c
}
func (c *tableViewImpl) Border() int {
return c.IAttr("border")
}
func (c *tableViewImpl) SetBorder(width int) {
c.SetIAttr("border", width)
}
func (c *tableViewImpl) CellSpacing() int {
return c.IAttr("cellspacing")
}
func (c *tableViewImpl) SetCellSpacing(spacing int) {
c.SetIAttr("cellspacing", spacing)
}
func (c *tableViewImpl) CellPadding() int {
return c.IAttr("cellpadding")
}
func (c *tableViewImpl) SetCellPadding(padding int) {
c.SetIAttr("cellpadding", padding)
}
var strStVAlign = []byte(` style="vertical-align:`) // ` style="vertical-align:`
// renderTr renders an HTML TR tag with horizontal and vertical
// alignment info included.
func (c *tableViewImpl) renderTr(w Writer) {
w.Write(strTROp)
if c.halign != HADefault {
w.Write(strAlign)
w.Writes(string(c.halign))
w.Write(strQuote)
}
if c.valign != VADefault {
w.Write(strStVAlign)
w.Writes(string(c.valign))
w.Write(strQuote)
}
w.Write(strGT)
}