英文:
Binding Table data in Go Fyne
问题
Fyne初学者在这里。
我正在尝试解决一个简单的用例,在文档中找不到任何解决方案:在Fyne中,如何使用数据源绑定数据到一个表格小部件?
换句话说,文档中有binding.BindStringList
,它允许绑定一个字符串列表...
data := binding.BindStringList(
&[]string{"Item 1", "Item 2", "Item 3"},
)
...我正在寻找类似的东西,它可以绑定一个结构体列表而不是字符串。例如,一个待办事项的表格:
type Todo struct {
UserID int `json:"userId,omitempty"`
ID int `json:"id,omitempty"`
Title string `json:"title,omitempty"`
Completed bool `json:"completed,omitempty"`
}
如果不可能,你认为最好的解决方法是什么?
好的,根据Andy的建议,我尝试了这个:
var data []Todo
stringData := `[{"userId":1,"id":1,"title":"delectus aut autem"},{"userId":1,"id":2,"title":"quis ut nam facilis et officia qui"}]`
json.Unmarshal([]byte(stringData), &data)
var bindings []binding.DataMap
for _, todo := range data {
bindings = append(bindings, binding.BindStruct(&todo))
}
list := widget.NewTable(
func() (int, int) {
return len(bindings), 4
},
func() fyne.CanvasObject {
return widget.NewLabel("wide content")
},
func(i widget.TableCellID, o fyne.CanvasObject) {
title, _ := bindings[i.Row].GetItem("Title")
log.Println(title)
o.(*widget.Label).SetText(title)
}
)
我无法访问我的元素的实际值(例如Title)。你能帮忙吗?
英文:
Fyne beginner here.
There is simple use case I'm trying to solve, without finding any solution in the docs: in Fyne, how to have a Table widget, with its data bound to a data source?
In other words, we have the binding.BindStringList
in the docs, that allows to bind a list of strings…
data := binding.BindStringList(
&[]string{"Item 1", "Item 2", "Item 3"},
)
…I am looking for something similar that would allow to bind a list of structs instead of string. For example, a table of todos:
type Todo struct {
UserID int `json:"userId,omitempty"`
ID int `json:"id,omitempty"`
Title string `json:"title,omitempty"`
Completed bool `json:"completed,omitempty"`
}
If it is not possible, what would seem like the best workaround for you?
Well, following Andy's suggestion, I tried this:
var data []Todo
stringData := `[{"userId":1,"id":1,"title":"delectus aut autem"},{"userId":1,"id":2,"title":"quis ut nam facilis et officia qui"}]`
json.Unmarshal([]byte(stringData), &data)
var bindings []binding.DataMap
for _, todo := range data {
bindings = append(bindings, binding.BindStruct(&todo))
}
list := widget.NewTable(
func() (int, int) {
return len(bindings), 4
},
func() fyne.CanvasObject {
return widget.NewLabel("wide content")
},
func(i widget.TableCellID, o fyne.CanvasObject) {
title, _ := bindings[i.Row].GetItem("Title")
log.Println(title)
o.(*widget.Label).SetText(title)
}
)
I don't manage to access the actual values of my elements (i.e. Title). Could you help?
答案1
得分: 4
很抱歉,目前还没有一个与数据绑定的Table
小部件。
在v2.1中,我们计划添加binding.BindMapList
,它将传递给NewTableWithData
。在即将发布的版本中。
在那之前,您可以维护一个binding.DataMap
项的切片,并访问其中的项,以便在Table更新回调方法中绑定各个项。
英文:
Unfortunately there is not currently a data bound Table
widget.
In v2.1 we plan to add binding.BindMapList
which would be passed to NewTableWithData
. In the upcoming release.
Until then you can maintain a slice of binding.DataMap
items and access the items in it to bind the individual items inside the Table update callback methods.
答案2
得分: 0
我处于类似的情况,并尝试在列表中使用你的解决方案。我的所有列表项都显示为最后一项的文本。我修改了range
循环如下所示,现在我得到了预期的结果:
for i, _ := range data {
bindings = append(bindings, binding.BindStruct(&data[i]))
}
我的用例与你的有些不同,但希望这能传达概念。
英文:
I am in a similar situation and tried your solution in a list. All of my list items were displaying the text of the last item. I modified the range
loop as follows and I now get expected results
for i, _ := range data {
bindings = append(bindings, binding.BindStruct(&data[i]))
}
My use case is a bit different than yours, but hopefully this will convey the concept.
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