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100 lines
3.0 KiB
100 lines
3.0 KiB
// Copyright (c) 2013-2016 by Michael Dvorkin. All Rights Reserved.
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// Use of this source code is governed by a MIT-style license that can
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// be found in the LICENSE file.
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package mop
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import `github.com/michaeldv/termbox-go`
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// ColumnEditor handles column sort order. When activated it highlights
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// current column name in the header, then waits for arrow keys (choose
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// another column), Enter (reverse sort order), or Esc (exit).
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type ColumnEditor struct {
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screen *Screen // Pointer to Screen so we could use screen.Draw().
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quotes *Quotes // Pointer to Quotes to redraw them when the sort order changes.
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layout *Layout // Pointer to Layout to redraw stock quotes header.
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profile *Profile // Pointer to Profile where we save newly selected sort order.
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}
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// Returns new initialized ColumnEditor struct. As part of initialization it
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// highlights current column name (as stored in Profile).
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func NewColumnEditor(screen *Screen, quotes *Quotes) *ColumnEditor {
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editor := &ColumnEditor{
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screen: screen,
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quotes: quotes,
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layout: screen.layout,
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profile: quotes.profile,
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}
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editor.selectCurrentColumn()
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return editor
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}
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// Handle takes over the keyboard events and dispatches them to appropriate
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// column editor handlers. It returns true when user presses Esc.
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func (editor *ColumnEditor) Handle(event termbox.Event) bool {
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defer editor.redrawHeader()
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switch event.Key {
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case termbox.KeyEsc:
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return editor.done()
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case termbox.KeyEnter:
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editor.execute()
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case termbox.KeyArrowLeft:
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editor.selectLeftColumn()
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case termbox.KeyArrowRight:
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editor.selectRightColumn()
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}
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return false
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}
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//-----------------------------------------------------------------------------
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func (editor *ColumnEditor) selectCurrentColumn() *ColumnEditor {
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editor.profile.selectedColumn = editor.profile.SortColumn
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editor.redrawHeader()
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return editor
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}
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//-----------------------------------------------------------------------------
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func (editor *ColumnEditor) selectLeftColumn() *ColumnEditor {
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editor.profile.selectedColumn--
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if editor.profile.selectedColumn < 0 {
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editor.profile.selectedColumn = editor.layout.TotalColumns() - 1
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}
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return editor
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}
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//-----------------------------------------------------------------------------
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func (editor *ColumnEditor) selectRightColumn() *ColumnEditor {
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editor.profile.selectedColumn++
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if editor.profile.selectedColumn > editor.layout.TotalColumns()-1 {
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editor.profile.selectedColumn = 0
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}
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return editor
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}
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//-----------------------------------------------------------------------------
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func (editor *ColumnEditor) execute() *ColumnEditor {
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if editor.profile.Reorder() == nil {
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editor.screen.Draw(editor.quotes)
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}
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return editor
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}
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//-----------------------------------------------------------------------------
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func (editor *ColumnEditor) done() bool {
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editor.profile.selectedColumn = -1
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return true
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}
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//-----------------------------------------------------------------------------
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func (editor *ColumnEditor) redrawHeader() {
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editor.screen.DrawLine(0, 4, editor.layout.Header(editor.profile))
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termbox.Flush()
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}
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