封装简单表格模型。 更多...
| 导入语句： | import Qt.labs.qmlmodels 1.0 |
| Since: | Qt 5.14 |
The TableModel type stores JavaScript/JSON objects as data for a table model that can be used with TableView . It is intended to support very simple models without requiring the creation of a custom QAbstractTableModel subclass in C++.
import QtQuick 2.12 import QtQuick.Window 2.12 import Qt.labs.qmlmodels 1.0 Window { width: 400 height: 400 visible: true TableView { anchors.fill: parent columnSpacing: 1 rowSpacing: 1 boundsBehavior: Flickable.StopAtBounds model: TableModel { TableModelColumn { display: "checked" } TableModelColumn { display: "amount" } TableModelColumn { display: "fruitType" } TableModelColumn { display: "fruitName" } TableModelColumn { display: "fruitPrice" } // Each row is one type of fruit that can be ordered rows: [ { // Each property is one cell/column. checked: false, amount: 1, fruitType: "Apple", fruitName: "Granny Smith", fruitPrice: 1.50 }, { checked: true, amount: 4, fruitType: "Orange", fruitName: "Navel", fruitPrice: 2.50 }, { checked: false, amount: 1, fruitType: "Banana", fruitName: "Cavendish", fruitPrice: 3.50 } ] } delegate: TextInput { text: model.display padding: 12 selectByMouse: true onAccepted: model.display = text Rectangle { anchors.fill: parent color: "#efefef" z: -1 } } } }
The model's initial row data is set with either the rows property or by calling appendRow() . Each column in the model is specified by declaring a TableModelColumn instance, where the order of each instance determines its column index. Once the model's Component::completed() signal has been emitted, the columns and roles will have been established and are then fixed for the lifetime of the model.
To access a specific row, the getRow() function can be used. It's also possible to access the model's JavaScript data directly via the rows property, but it is not possible to modify the model data this way.
To add new rows, use appendRow() and insertRow() . To modify existing rows, use setRow() , moveRow() , removeRow() ，和 clear() .
It is also possible to modify the model's data via the delegate, as shown in the example above:
delegate: TextInput {
text: model.display
padding: 12
selectByMouse: true
onAccepted: model.display = text
Rectangle {
anchors.fill: parent
color: "#efefef"
z: -1
}
}
If the type of the data at the modified role does not match the type of the data that is set, it will be automatically converted via QVariant .
TableModel is designed to work with JavaScript/JSON data, where each row is a simple key-pair object:
{
// Each property is one cell/column.
checked: false,
amount: 1,
fruitType: "Apple",
fruitName: "Granny Smith",
fruitPrice: 1.50
},
// ...
As model manipulation in Qt is done via row and column indices, and because object keys are unordered, each column must be specified via TableModelColumn . This allows mapping Qt's built-in roles to any property in each row object.
Complex row structures are supported, but with limited functionality. As TableModel has no way of knowing how each row is structured, it cannot manipulate it. As a consequence of this, the copy of the model data that TableModel has stored in rows is not kept in sync with the source data that was set in QML. For these reasons, TableModel relies on the user to handle simple data manipulation.
For example, suppose you wanted to have several roles per column. One way of doing this is to use a data source where each row is an array and each cell is an object. To use this data source with TableModel, define a getter and setter:
TableModel {
TableModelColumn {
display: function(modelIndex) { return rows[modelIndex.row][0].checked }
setDisplay: function(modelIndex, cellData) { rows[modelIndex.row][0].checked = cellData }
}
// ...
rows: [
[
{ checked: false, checkable: true },
{ amount: 1 },
{ fruitType: "Apple" },
{ fruitName: "Granny Smith" },
{ fruitPrice: 1.50 }
]
// ...
]
}
The row above is one example of a complex row.
注意： Row manipulation functions such as appendRow() , removeRow() , etc. are not supported when using complex rows.
For most real world use cases, it is recommended to use DelegateChooser as the delegate of a TableView that uses TableModel. This allows you to use specific roles in the relevant delegates. For example, the snippet above can be rewritten to use DelegateChooser like so:
import QtQuick 2.12 import QtQuick.Controls 2.5 import Qt.labs.qmlmodels 1.0 ApplicationWindow { width: 400 height: 400 visible: true TableView { anchors.fill: parent columnSpacing: 1 rowSpacing: 1 boundsBehavior: Flickable.StopAtBounds model: TableModel { TableModelColumn { display: "checked" } TableModelColumn { display: "amount" } TableModelColumn { display: "fruitType" } TableModelColumn { display: "fruitName" } TableModelColumn { display: "fruitPrice" } // Each row is one type of fruit that can be ordered rows: [ { // Each property is one cell/column. checked: false, amount: 1, fruitType: "Apple", fruitName: "Granny Smith", fruitPrice: 1.50 }, { checked: true, amount: 4, fruitType: "Orange", fruitName: "Navel", fruitPrice: 2.50 }, { checked: false, amount: 1, fruitType: "Banana", fruitName: "Cavendish", fruitPrice: 3.50 } ] } delegate: DelegateChooser { DelegateChoice { column: 0 delegate: CheckBox { checked: model.display onToggled: model.display = checked } } DelegateChoice { column: 1 delegate: SpinBox { value: model.display onValueModified: model.display = value } } DelegateChoice { delegate: TextField { text: model.display selectByMouse: true implicitWidth: 140 onAccepted: model.display = text } } } } }
The most specific delegates are declared first: the columns at index
0
and
1
have
bool
and
integer
data types, so they use a
CheckBox
and
SpinBox
, respectively. The remaining columns can simply use a
TextField
, and so that delegate is declared last as a fallback.
另请参阅 TableModelColumn , TableView ，和 QAbstractTableModel .
|
[read-only] columnCount : int |
This read-only property holds the number of columns in the model.
The number of columns is fixed for the lifetime of the model after the rows property is set or appendRow() is called for the first time.
|
[read-only] rowCount : int |
This read-only property holds the number of rows in the model.
This value changes whenever rows are added or removed from the model.
This property holds the model data in the form of an array of rows:
rows: [
{
// Each property is one cell/column.
checked: false,
amount: 1,
fruitType: "Apple",
fruitName: "Granny Smith",
fruitPrice: 1.50
},
{
checked: true,
amount: 4,
fruitType: "Orange",
fruitName: "Navel",
fruitPrice: 2.50
},
{
checked: false,
amount: 1,
fruitType: "Banana",
fruitName: "Cavendish",
fruitPrice: 3.50
}
]
另请参阅 getRow() , setRow() , moveRow() , appendRow() , insertRow() , clear() , rowCount ，和 columnCount .
Adds a new row to the end of the model, with the values (cells) in row .
model.appendRow({ checkable: true, amount: 1, fruitType: "Pear", fruitName: "Williams", fruitPrice: 1.50, })
另请参阅 insertRow() , setRow() ，和 removeRow() .
Removes all rows from the model.
另请参阅 removeRow() .
Returns the data from the table cell at the given index belonging to the given role .
|
object getRow ( int rowIndex ) |
Returns the row at rowIndex in the model.
Note that this equivalent to accessing the row directly through the rows 特性：
Component.onCompleted: { // These two lines are equivalent. console.log(model.getRow(0).display); console.log(model.rows[0].fruitName); }
注意： the returned object cannot be used to modify the contents of the model; use setRow() 代替。
另请参阅 setRow() , appendRow() , insertRow() , removeRow() ，和 moveRow() .
返回 QModelIndex object referencing the given row and column , which can be passed to the data() function to get the data from that cell, or to setData() to edit the contents of that cell.
import QtQml 2.14 import Qt.labs.qmlmodels 1.0 TableModel { id: model TableModelColumn { display: "fruitType" } TableModelColumn { display: "fruitPrice" } rows: [ { fruitType: "Apple", fruitPrice: 1.50 }, { fruitType: "Orange", fruitPrice: 2.50 } ] Component.onCompleted: { for (var r = 0; r < model.rowCount; ++r) { console.log("An " + model.data(model.index(r, 0)).display + " costs " + model.data(model.index(r, 1)).display.toFixed(2)) } } }
另请参阅 QModelIndex and related Classes in QML and data() .
|
insertRow ( int rowIndex , object row ) |
Adds a new row to the list model at position rowIndex , with the values (cells) in row .
model.insertRow(2, { checkable: true, checked: false, amount: 1, fruitType: "Pear", fruitName: "Williams", fruitPrice: 1.50, })
rowIndex must be to an existing item in the list, or one past the end of the list (equivalent to appendRow() ).
另请参阅 appendRow() , setRow() , removeRow() ，和 rowCount .
移动 rows from the index at fromRowIndex to the index at toRowIndex .
The from and to ranges must exist; for example, to move the first 3 items to the end of the list:
model.moveRow(0, model.rowCount - 3, 3)
另请参阅 appendRow() , insertRow() , removeRow() ，和 rowCount .
Removes the row at rowIndex from the model.
|
bool setData ( QModelIndex index , string role , variant value ) |
Inserts or updates the data field named by role in the table cell at the given index with value . Returns true if sucessful, false if not.
|
setRow ( int rowIndex , object row ) |
Changes the row at rowIndex in the model with row .
All columns/cells must be present in
row
, and in the correct order.
model.setRow(0, { checkable: true, amount: 1, fruitType: "Pear", fruitName: "Williams", fruitPrice: 1.50, })
若
rowIndex
等于
rowCount()
, then a new row is appended to the model. Otherwise,
rowIndex
must point to an existing row in the model.
另请参阅 appendRow() , insertRow() ，和 rowCount .