1f765c8695
Add mouse support
391 lines
8.3 KiB
Go
391 lines
8.3 KiB
Go
package cview
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import (
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"sync"
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"github.com/gdamore/tcell"
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)
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// page represents one page of a Pages object.
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type page struct {
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Name string // The page's name.
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Item Primitive // The page's primitive.
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Resize bool // Whether or not to resize the page when it is drawn.
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Visible bool // Whether or not this page is visible.
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}
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// Pages is a container for other primitives often used as the application's
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// root primitive. It allows to easily switch the visibility of the contained
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// primitives.
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//
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// See https://gitlab.com/tslocum/cview/wiki/Pages for an example.
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type Pages struct {
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*Box
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// The contained pages. (Visible) pages are drawn from back to front.
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pages []*page
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// We keep a reference to the function which allows us to set the focus to
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// a newly visible page.
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setFocus func(p Primitive)
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// An optional handler which is called whenever the visibility or the order of
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// pages changes.
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changed func()
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sync.Mutex
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}
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// NewPages returns a new Pages object.
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func NewPages() *Pages {
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p := &Pages{
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Box: NewBox(),
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}
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p.focus = p
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return p
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}
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// SetChangedFunc sets a handler which is called whenever the visibility or the
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// order of any visible pages changes. This can be used to redraw the pages.
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func (p *Pages) SetChangedFunc(handler func()) *Pages {
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p.Lock()
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defer p.Unlock()
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p.changed = handler
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return p
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}
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// GetPageCount returns the number of pages currently stored in this object.
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func (p *Pages) GetPageCount() int {
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p.Lock()
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defer p.Unlock()
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return len(p.pages)
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}
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// AddPage adds a new page with the given name and primitive. If there was
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// previously a page with the same name, it is overwritten. Leaving the name
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// empty may cause conflicts in other functions so always specify a non-empty
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// name.
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//
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// Visible pages will be drawn in the order they were added (unless that order
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// was changed in one of the other functions). If "resize" is set to true, the
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// primitive will be set to the size available to the Pages primitive whenever
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// the pages are drawn.
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func (p *Pages) AddPage(name string, item Primitive, resize, visible bool) *Pages {
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hasFocus := p.HasFocus()
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p.Lock()
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defer p.Unlock()
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for index, pg := range p.pages {
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if pg.Name == name {
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p.pages = append(p.pages[:index], p.pages[index+1:]...)
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break
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}
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}
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p.pages = append(p.pages, &page{Item: item, Name: name, Resize: resize, Visible: visible})
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if p.changed != nil {
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p.Unlock()
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p.changed()
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p.Lock()
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}
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if hasFocus {
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p.Unlock()
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p.Focus(p.setFocus)
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p.Lock()
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}
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return p
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}
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// AddAndSwitchToPage calls AddPage(), then SwitchToPage() on that newly added
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// page.
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func (p *Pages) AddAndSwitchToPage(name string, item Primitive, resize bool) *Pages {
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p.AddPage(name, item, resize, true)
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p.SwitchToPage(name)
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return p
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}
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// RemovePage removes the page with the given name. If that page was the only
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// visible page, visibility is assigned to the last page.
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func (p *Pages) RemovePage(name string) *Pages {
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hasFocus := p.HasFocus()
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p.Lock()
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defer p.Unlock()
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var isVisible bool
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for index, page := range p.pages {
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if page.Name == name {
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isVisible = page.Visible
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p.pages = append(p.pages[:index], p.pages[index+1:]...)
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if page.Visible && p.changed != nil {
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p.Unlock()
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p.changed()
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p.Lock()
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}
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break
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}
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}
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if isVisible {
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for index, page := range p.pages {
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if index < len(p.pages)-1 {
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if page.Visible {
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break // There is a remaining visible page.
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}
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} else {
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page.Visible = true // We need at least one visible page.
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}
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}
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}
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if hasFocus {
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p.Unlock()
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p.Focus(p.setFocus)
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p.Lock()
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}
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return p
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}
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// HasPage returns true if a page with the given name exists in this object.
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func (p *Pages) HasPage(name string) bool {
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p.Lock()
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defer p.Unlock()
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for _, page := range p.pages {
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if page.Name == name {
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return true
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}
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}
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return false
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}
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// ShowPage sets a page's visibility to "true" (in addition to any other pages
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// which are already visible).
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func (p *Pages) ShowPage(name string) *Pages {
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hasFocus := p.HasFocus()
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p.Lock()
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defer p.Unlock()
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for _, page := range p.pages {
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if page.Name == name {
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page.Visible = true
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if p.changed != nil {
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p.Unlock()
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p.changed()
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p.Lock()
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}
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break
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}
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}
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if hasFocus {
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p.Unlock()
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p.Focus(p.setFocus)
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p.Lock()
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}
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return p
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}
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// HidePage sets a page's visibility to "false".
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func (p *Pages) HidePage(name string) *Pages {
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hasFocus := p.HasFocus()
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p.Lock()
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defer p.Unlock()
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for _, page := range p.pages {
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if page.Name == name {
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page.Visible = false
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if p.changed != nil {
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p.Unlock()
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p.changed()
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p.Lock()
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}
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break
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}
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}
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if hasFocus {
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p.Unlock()
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p.Focus(p.setFocus)
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p.Lock()
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}
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return p
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}
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// SwitchToPage sets a page's visibility to "true" and all other pages'
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// visibility to "false".
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func (p *Pages) SwitchToPage(name string) *Pages {
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hasFocus := p.HasFocus()
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p.Lock()
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defer p.Unlock()
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for _, page := range p.pages {
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if page.Name == name {
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page.Visible = true
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} else {
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page.Visible = false
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}
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}
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if p.changed != nil {
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p.Unlock()
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p.changed()
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p.Lock()
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}
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if hasFocus {
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p.Unlock()
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p.Focus(p.setFocus)
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p.Lock()
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}
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return p
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}
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// SendToFront changes the order of the pages such that the page with the given
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// name comes last, causing it to be drawn last with the next update (if
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// visible).
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func (p *Pages) SendToFront(name string) *Pages {
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hasFocus := p.HasFocus()
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p.Lock()
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defer p.Unlock()
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for index, page := range p.pages {
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if page.Name == name {
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if index < len(p.pages)-1 {
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p.pages = append(append(p.pages[:index], p.pages[index+1:]...), page)
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}
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if page.Visible && p.changed != nil {
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p.Lock()
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p.changed()
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p.Unlock()
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}
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break
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}
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}
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if hasFocus {
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p.Lock()
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p.Focus(p.setFocus)
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p.Unlock()
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}
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return p
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}
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// SendToBack changes the order of the pages such that the page with the given
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// name comes first, causing it to be drawn first with the next update (if
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// visible).
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func (p *Pages) SendToBack(name string) *Pages {
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hasFocus := p.HasFocus()
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p.Lock()
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defer p.Unlock()
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for index, pg := range p.pages {
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if pg.Name == name {
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if index > 0 {
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p.pages = append(append([]*page{pg}, p.pages[:index]...), p.pages[index+1:]...)
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}
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if pg.Visible && p.changed != nil {
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p.Unlock()
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p.changed()
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p.Lock()
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}
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break
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}
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}
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if hasFocus {
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p.Unlock()
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p.Focus(p.setFocus)
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p.Lock()
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}
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return p
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}
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// GetFrontPage returns the front-most visible page. If there are no visible
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// pages, ("", nil) is returned.
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func (p *Pages) GetFrontPage() (name string, item Primitive) {
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p.Lock()
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defer p.Unlock()
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for index := len(p.pages) - 1; index >= 0; index-- {
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if p.pages[index].Visible {
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return p.pages[index].Name, p.pages[index].Item
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}
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}
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return
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}
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// HasFocus returns whether or not this primitive has focus.
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func (p *Pages) HasFocus() bool {
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p.Lock()
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defer p.Unlock()
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for _, page := range p.pages {
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if page.Item.GetFocusable().HasFocus() {
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return true
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}
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}
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return false
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}
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// Focus is called by the application when the primitive receives focus.
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func (p *Pages) Focus(delegate func(p Primitive)) {
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p.Lock()
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defer p.Unlock()
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if delegate == nil {
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return // We cannot delegate so we cannot focus.
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}
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p.setFocus = delegate
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var topItem Primitive
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for _, page := range p.pages {
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if page.Visible {
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topItem = page.Item
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}
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}
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if topItem != nil {
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p.Unlock()
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delegate(topItem)
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p.Lock()
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}
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}
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// Draw draws this primitive onto the screen.
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func (p *Pages) Draw(screen tcell.Screen) {
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p.Box.Draw(screen)
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p.Lock()
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defer p.Unlock()
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for _, page := range p.pages {
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if !page.Visible {
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continue
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}
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if page.Resize {
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x, y, width, height := p.GetInnerRect()
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page.Item.SetRect(x, y, width, height)
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}
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page.Item.Draw(screen)
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}
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}
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// MouseHandler returns the mouse handler for this primitive.
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func (p *Pages) MouseHandler() func(action MouseAction, event *tcell.EventMouse, setFocus func(p Primitive)) (consumed bool, capture Primitive) {
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return p.WrapMouseHandler(func(action MouseAction, event *tcell.EventMouse, setFocus func(p Primitive)) (consumed bool, capture Primitive) {
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if !p.InRect(event.Position()) {
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return false, nil
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}
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// Pass mouse events along to the last visible page item that takes it.
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for index := len(p.pages) - 1; index >= 0; index-- {
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page := p.pages[index]
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if page.Visible {
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consumed, capture = page.Item.MouseHandler()(action, event, setFocus)
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if consumed {
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return
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}
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}
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}
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return
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})
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}
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