67 lines
1.9 KiB
Go
67 lines
1.9 KiB
Go
// 28 july 2014
|
|
|
|
package ui
|
|
|
|
import (
|
|
"fmt"
|
|
"reflect"
|
|
"sync"
|
|
)
|
|
|
|
// Table is a Control that displays a list of like-structured data in a grid where each row represents an item and each column represents a bit of data.
|
|
// As such, a Table renders a []struct{...} where each field of the struct can be a string, a number, [TODO an image, or a checkbox].
|
|
// Tables maintain their own storage behind a sync.RWMutex-compatible sync.Locker; use Table.Lock()/Table.Unlock() to make changes and Table.RLock()/Table.RUnlock() to merely read values.
|
|
// TODO headers
|
|
type Table interface {
|
|
// Lock and Unlock lock and unlock Data for reading or writing.
|
|
// RLock and RUnlock lock and unlock Data for reading only.
|
|
// These methods have identical semantics to the analogous methods of sync.RWMutex.
|
|
Lock()
|
|
Unlock()
|
|
RLock()
|
|
RUnlock()
|
|
|
|
// Data returns the internal data.
|
|
// The returned value will contain an object of type pointer to slice of some structure; use a type assertion to get the properly typed object out.
|
|
// Do not call this outside a Lock()..Unlock() or RLock()..RUnlock() pair.
|
|
Data() interface{}
|
|
}
|
|
|
|
type tablebase struct {
|
|
lock sync.RWMutex
|
|
data interface{}
|
|
}
|
|
|
|
// NewTable creates a new Table.
|
|
// Currently, the argument must be a reflect.Type representing the structure that each item in the Table will hold, and the Table will be initially empty.
|
|
// This will change in the future.
|
|
func NewTable(ty reflect.Type) Table {
|
|
if ty.Kind() != reflect.Struct {
|
|
panic(fmt.Errorf("unknown or unsupported type %v given to NewTable()", ty))
|
|
}
|
|
b := new(tablebase)
|
|
// arbitrary starting capacity
|
|
b.data = reflect.NewSlice(ty, 0, 512).Addr().Interface()
|
|
return finishNewTable(b)
|
|
}
|
|
|
|
func (b *tablebase) Lock() {
|
|
b.lock.Lock()
|
|
}
|
|
|
|
func (b *tablebase) Unlock() {
|
|
b.lock.Unlock()
|
|
}
|
|
|
|
func (b *tablebase) RLock() {
|
|
b.lock.RLock()
|
|
}
|
|
|
|
func (b *tablebase) RUnlock() {
|
|
b.lock.RUnlock()
|
|
}
|
|
|
|
func (b *tablebase) Data() {
|
|
return b.data
|
|
}
|