6 "github.com/zyedidia/tcell"
12 // This contains all the views in this tab
13 // There is generally only one view per tab, but you can have
14 // multiple views with splits
16 // This is the current view for this tab
22 // NewTabFromView creates a new tab and puts the given view in the tab
23 func NewTabFromView(v *View) *Tab {
25 t.views = append(t.views, v)
28 t.tree = new(SplitTree)
29 t.tree.kind = VerticalSplit
30 t.tree.children = []Node{NewLeafNode(t.views[0], t.tree)}
36 if globalSettings["infobar"].(bool) {
45 // SetNum sets all this tab's views to have the correct tab number
46 func (t *Tab) SetNum(num int) {
48 for _, v := range t.views {
53 func (t *Tab) Cleanup() {
57 func (t *Tab) Resize() {
62 if globalSettings["infobar"].(bool) {
68 for i, v := range t.views {
73 // CurView returns the current view
74 func CurView() *View {
75 curTab := tabs[curTab]
76 return curTab.views[curTab.CurView]
79 // TabbarString returns the string that should be displayed in the tabbar
80 // It also returns a map containing which indicies correspond to which tab number
81 // This is useful when we know that the mouse click has occurred at an x location
82 // but need to know which tab that corresponds to to accurately change the tab
83 func TabbarString() (string, map[int]int) {
85 indicies := make(map[int]int)
86 for i, t := range tabs {
92 buf := t.views[t.CurView].Buf
102 indicies[Count(str)-1] = i + 1
108 // TabbarHandleMouseEvent checks the given mouse event if it is clicking on the tabbar
109 // If it is it changes the current tab accordingly
110 // This function returns true if the tab is changed
111 func TabbarHandleMouseEvent(event tcell.Event) bool {
112 // There is no tabbar displayed if there are less than 2 tabs
117 switch e := event.(type) {
118 case *tcell.EventMouse:
119 button := e.Buttons()
120 // Must be a left click
121 if button == tcell.Button1 {
126 str, indicies := TabbarString()
127 if x+tabBarOffset >= len(str) {
132 for k := range indicies {
133 keys = append(keys, k)
136 for _, k := range keys {
137 if x+tabBarOffset <= k {
138 tabnum = indicies[k] - 1
150 // DisplayTabs displays the tabbar at the top of the editor if there are multiple tabs
156 str, indicies := TabbarString()
158 tabBarStyle := defStyle.Reverse(true)
159 if style, ok := colorscheme["tabbar"]; ok {
163 // Maybe there is a unicode filename?
164 fileRunes := []rune(str)
165 w, _ := screen.Size()
166 tooWide := (w < len(fileRunes))
168 // if the entire tab-bar is longer than the screen is wide,
169 // then it should be truncated appropriately to keep the
170 // active tab visible on the UI.
172 // first we have to work out where the selected tab is
173 // out of the total length of the tab bar. this is done
174 // by extracting the hit-areas from the indicies map
175 // that was constructed by `TabbarString()`
177 for offset := range indicies {
178 keys = append(keys, offset)
180 // sort them to be in ascending order so that values will
181 // correctly reflect the displayed ordering of the tabs
183 // record the offset of each tab and the previous tab so
184 // we can find the position of the tab's hit-box.
185 previousTabOffset := 0
186 currentTabOffset := 0
187 for _, k := range keys {
188 tabIndex := indicies[k] - 1
189 if tabIndex == curTab {
193 // this is +2 because there are two padding spaces that aren't accounted
194 // for in the display. please note that this is for cosmetic purposes only.
195 previousTabOffset = k + 2
197 // get the width of the hitbox of the active tab, from there calculate the offsets
198 // to the left and right of it to approximately center it on the tab bar display.
199 centeringOffset := (w - (currentTabOffset - previousTabOffset))
200 leftBuffer := previousTabOffset - (centeringOffset / 2)
201 rightBuffer := currentTabOffset + (centeringOffset / 2)
203 // check to make sure we haven't overshot the bounds of the string,
204 // if we have, then take that remainder and put it on the left side
205 overshotRight := rightBuffer - len(fileRunes)
206 if overshotRight > 0 {
207 leftBuffer = leftBuffer + overshotRight
210 overshotLeft := leftBuffer - 0
211 if overshotLeft < 0 {
213 rightBuffer = leftBuffer + (w - 1)
215 rightBuffer = leftBuffer + (w - 2)
218 if rightBuffer > len(fileRunes)-1 {
219 rightBuffer = len(fileRunes) - 1
222 // construct a new buffer of text to put the
223 // newly formatted tab bar text into.
224 var displayText []rune
226 // if the left-side of the tab bar isn't at the start
227 // of the constructed tab bar text, then show that are
228 // more tabs to the left by displaying a "+"
230 displayText = append(displayText, '+')
232 // copy the runes in from the original tab bar text string
233 // into the new display buffer
234 for x := leftBuffer; x < rightBuffer; x++ {
235 displayText = append(displayText, fileRunes[x])
237 // if there is more text to the right of the right-most
238 // column in the tab bar text, then indicate there are more
239 // tabs to the right by displaying a "+"
240 if rightBuffer < len(fileRunes)-1 {
241 displayText = append(displayText, '+')
244 // now store the offset from zero of the left-most text
245 // that is being displayed. This is to ensure that when
246 // clicking on the tab bar, the correct tab gets selected.
247 tabBarOffset = leftBuffer
249 // use the constructed buffer as the display buffer to print
251 fileRunes = displayText
256 // iterate over the width of the terminal display and for each column,
257 // write a character into the tab display area with the appropriate style.
258 for x := 0; x < w; x++ {
259 if x < len(fileRunes) {
260 screen.SetContent(x, 0, fileRunes[x], nil, tabBarStyle)
262 screen.SetContent(x, 0, ' ', nil, tabBarStyle)