The diagram can be scrolled by using the vertical and horizontal scrollbars. In addition to the scrollbars,mousewheel can be used to scroll the diagram.
Diagram’s scrollSettings enable you to read the current scroll status, view port size, current zoom, and zoom factor. It also allows you to scroll the diagram programmatically.
Scroll settings allow you to read the scroll status, viewPortWidth, viewPortHeight, and currentZoom with a set of properties. To explore those properties, see Scroll Settings.
Diagram allows you to pan the diagram before loading, so that any desired region of a large diagram is made to view. You can programmatically pan the diagram with the horizontalOffset and verticalOffset properties of scroll settings. The following code illustrates how to set pan the diagram programmatically.
In the following example, the vertical scroll bar is scrolled down by 50px and horizontal scroll bar is scrolled to right by 100px.
import { Component, ViewEncapsulation, OnInit, ViewChild } from '@angular/core';
import { DiagramComponent, Diagram, ScrollSettingsModel } from '@syncfusion/ej2-angular-diagrams';
@Component({
selector: "app-container",
template: `<ejs-diagram #diagram id="diagram" width="100%" height="580px" [scrollSettings]="scrollSettings">
</ejs-diagram>`,
encapsulation: ViewEncapsulation.None
})
export class AppComponent {
@ViewChild("diagram")
public diagram: DiagramComponent;
public scrollSettings: ScrollSettingsModel;
ngOnInit(): void {
// Defines the pageSettings for the diagram
this.scrollSettings = {
horizontalOffset: 100,
verticalOffset: 50
}
}
}import { NgModule } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { AppComponent } from './app.component';
import { DiagramModule } from '@syncfusion/ej2-angular-diagrams';
/**
* Module
*/
@NgModule({
imports: [
BrowserModule, DiagramModule
],
declarations: [AppComponent],
bootstrap: [AppComponent],
providers: [ ]
})
export class AppModule { }import { platformBrowserDynamic } from '@angular/platform-browser-dynamic';
import { enableProdMode } from '@angular/core';
import { AppModule } from './app.module';
enableProdMode();
platformBrowserDynamic().bootstrapModule(AppModule);You can programmatically change the scroll offsets at runtime by using the client-side method update. The following code illustrates how to change the scroll offsets and zoom factor at runtime.
import { Component, ViewEncapsulation, ViewChild } from '@angular/core';
import { DiagramComponent, Diagram } from '@syncfusion/ej2-angular-diagrams';
@Component({
selector: "app-container",
template: `<ejs-diagram #diagram id="diagram" width="100%" height="580px" (created)='created($event)'>
</ejs-diagram>`,
encapsulation: ViewEncapsulation.None
})
export class AppComponent {
@ViewChild("diagram")
public diagram: DiagramComponent;
public created(args: Object): void {
//Updates scroll settings
this.diagram.scrollSettings.horizontalOffset=200;
this.diagram.scrollSettings.verticalOffset=30
this.diagram.dataBind();
}
}import { NgModule } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { AppComponent } from './app.component';
import { DiagramModule } from '@syncfusion/ej2-angular-diagrams';
/**
* Module
*/
@NgModule({
imports: [
BrowserModule, DiagramModule
],
declarations: [AppComponent],
bootstrap: [AppComponent],
providers: [ ]
})
export class AppModule { }import { platformBrowserDynamic } from '@angular/platform-browser-dynamic';
import { enableProdMode } from '@angular/core';
import { AppModule } from './app.module';
enableProdMode();
platformBrowserDynamic().bootstrapModule(AppModule);Autoscroll feature automatically scrolls the diagram, whenever the node or connector is moved beyond the boundary of the diagram. So that, it is always visible during dragging, resizing, and multiple selection operations. Autoscroll is automatically triggered when any one of the following is done towards the edges of the diagram.
The diagram client-side event ScrollChange gets triggered when the autoscroll (scrollbars) is changed and you can do your own customization in this event.
The autoscroll behavior in your diagram can be enabled/disabled by using the canAutoScroll property of the diagram. The following code example illustrates how to set autoscroll.
import { Component, ViewEncapsulation,OnInit, ViewChild } from '@angular/core';
import { DiagramComponent, Diagram, NodeModel, ConnectorModel, PointModel, ScrollSettingsModel } from '@syncfusion/ej2-angular-diagrams';
@Component({
selector: "app-container",
template: `<ejs-diagram #diagram id="diagram" width="100%" height="600px" [getNodeDefaults] ='getNodeDefaults' [getConnectorDefaults] ='getConnectorDefaults' [scrollSettings]='scrollSettings'>
<e-nodes>
<e-node id: 'Start' [offsetX]=100 [offsetY]=100>
<e-node-annotations>
<e-node-annotation content="Start" >
</e-node-annotation>
</e-node-annotations>
</e-node>
</e-nodes>
</ejs-diagram>`,
encapsulation: ViewEncapsulation.None
})
export class AppComponent {
@ViewChild("diagram")
public diagram: DiagramComponent;
public scrollSettings: ScrollSettingsModel;
ngOnInit(): void {
// Defines the scrollSettings for the diagram
this.scrollSettings = {
//Sets the scroll limit
canAutoScroll: true, scrollLimit: 'Infinity'
}
}
public getNodeDefaults(node: NodeModel): NodeModel {
node.height = 100;
node.width = 100;
node.style.fill = "#6BA5D7";
node.style.strokeColor = "White";
return node;
}
public getConnectorDefaults(obj: ConnectorModel): ConnectorModel {
obj.style = {
strokeColor: '#6BA5D7',
fill: '#6BA5D7',
strokeWidth: 2
}
obj.targetDecorator = {
style: {
fill: '#6BA5D7',
strokeColor: '#6BA5D7'
}
}
}
}import { NgModule } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { AppComponent } from './app.component';
import { DiagramModule } from '@syncfusion/ej2-angular-diagrams';
/**
* Module
*/
@NgModule({
imports: [
BrowserModule, DiagramModule
],
declarations: [AppComponent],
bootstrap: [AppComponent],
providers: [ ]
})
export class AppModule { }import { platformBrowserDynamic } from '@angular/platform-browser-dynamic';
import { enableProdMode } from '@angular/core';
import { AppModule } from './app.module';
enableProdMode();
platformBrowserDynamic().bootstrapModule(AppModule);The autoscroll border is used to specify the maximum distance between the object and diagram edge to trigger autoscroll. The default value is set as 15 for all sides (left, right, top, and bottom) and it can be changed by using the autoScrollBorder property of page settings. The following code example illustrates how to set autoscroll border.
import { Component, ViewEncapsulation, OnInit, ViewChild } from '@angular/core';
import { DiagramComponent, Diagram, NodeModel, ScrollSettingsModel } from '@syncfusion/ej2-angular-diagrams';
@Component({
selector: "app-container",
template: `<ejs-diagram #diagram id="diagram" width="100%" height="580px" [getNodeDefaults] ='getNodeDefaults' [scrollSettings]="scrollSettings">
<e-nodes>
<e-node id='node1' [offsetX]=150 [offsetY]=150>
</e-node>
</e-nodes>
</ejs-diagram>`,
encapsulation: ViewEncapsulation.None
})
export class AppComponent {
@ViewChild("diagram")
public diagram: DiagramComponent;
public scrollSettings: ScrollSettingsModel;
ngOnInit(): void {
// Defines the pageSettings for the diagram
this.scrollSettings = {
left: 100,
right: 100,
top: 100,
bottom: 100
}
}
public getNodeDefaults(node: NodeModel): NodeModel {
node.height = 100;
node.width = 100;
node.style.fill = "#6BA5D7";
node.style.strokeColor = "White";
return node;
}
}import { NgModule } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { AppComponent } from './app.component';
import { DiagramModule } from '@syncfusion/ej2-angular-diagrams';
/**
* Module
*/
@NgModule({
imports: [
BrowserModule, DiagramModule
],
declarations: [AppComponent],
bootstrap: [AppComponent],
providers: [ ]
})
export class AppModule { }import { platformBrowserDynamic } from '@angular/platform-browser-dynamic';
import { enableProdMode } from '@angular/core';
import { AppModule } from './app.module';
enableProdMode();
platformBrowserDynamic().bootstrapModule(AppModule);The scroll limit allows you to define the scrollable region of the diagram. It includes the following options:
scrollLimit property of scroll settings helps to limit the scrolling.The scrollSettings scrollableArea allow to extend the scrollable region that is based on the scroll limit.
The following code example illustrates how to specify the scroll limit.
import { Component, ViewEncapsulation, OnInit, ViewChild } from '@angular/core';
import { DiagramComponent, Diagram, NodeModel, ScrollSettingsModel } from '@syncfusion/ej2-angular-diagrams';
@Component({
selector: "app-container",
template: `<ejs-diagram #diagram id="diagram" width="100%" height="580px" [getNodeDefaults] ='getNodeDefaults' [scrollSettings]="scrollSettings">
<e-nodes>
<e-node id='node1' [offsetX]=150 [offsetY]=150>
</e-node>
</e-nodes>
</ejs-diagram>`,
encapsulation: ViewEncapsulation.None
})
export class AppComponent {
@ViewChild("diagram")
public diagram: DiagramComponent;
public scrollSettings: ScrollSettingsModel;
ngOnInit(): void {
// Defines the pageSettings for the diagram
this.scrollSettings = {
//Sets the scroll limit
scrollLimit: 'infinity'
}
}
public getNodeDefaults(node: NodeModel): NodeModel {
node.height = 100;
node.width = 100;
node.style.fill = "#6BA5D7";
node.style.strokeColor = "White";
return node;
}
}import { NgModule } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { AppComponent } from './app.component';
import { DiagramModule } from '@syncfusion/ej2-angular-diagrams';
/**
* Module
*/
@NgModule({
imports: [
BrowserModule, DiagramModule
],
declarations: [AppComponent],
bootstrap: [AppComponent],
providers: [ ]
})
export class AppModule { }import { platformBrowserDynamic } from '@angular/platform-browser-dynamic';
import { enableProdMode } from '@angular/core';
import { AppModule } from './app.module';
enableProdMode();
platformBrowserDynamic().bootstrapModule(AppModule);The padding property of scroll settings allows you to extend the scrollable region that is based on the scroll limit.
The following code example illustrates how to set scroll padding to diagram region.
import { Component, ViewEncapsulation, OnInit, ViewChild } from '@angular/core';
import { DiagramComponent, Diagram, NodeModel, ScrollSettingsModel } from '@syncfusion/ej2-angular-diagrams';
@Component({
selector: "app-container",
template: `<ejs-diagram #diagram id="diagram" width="100%" height="580px" [getNodeDefaults] ='getNodeDefaults' [scrollSettings]="scrollSettings" nodes =nodes>
</ejs-diagram>`,
encapsulation: ViewEncapsulation.None
})
export class AppComponent {
public nodes: NodeModel[] = [
{
id: 'Start',
width: 100, height: 100,
offsetX: 350, offsetY: 350,
shape: {
type: 'Flow',
shape: 'Terminator'
}
}]
@ViewChild("diagram")
public diagram: DiagramComponent;
public scrollSettings: ScrollSettingsModel;
ngOnInit(): void {
// Defines the pageSettings for the diagram
this.scrollSettings = {
//Sets the scroll limit
padding: { right: 50, bottom: 50 }
}
}
public getNodeDefaults(node: NodeModel): NodeModel {
node.margin.top = 0;
node.margin.bottom = 0;
node.margin.left = 25;
node.margin.right = 0;
return node;
}
}import { NgModule } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { AppComponent } from './app.component';
import { DiagramModule } from '@syncfusion/ej2-angular-diagrams';
/**
* Module
*/
@NgModule({
imports: [
BrowserModule, DiagramModule
],
declarations: [AppComponent],
bootstrap: [AppComponent],
providers: [ ]
})
export class AppModule { }import { platformBrowserDynamic } from '@angular/platform-browser-dynamic';
import { enableProdMode } from '@angular/core';
import { AppModule } from './app.module';
enableProdMode();
platformBrowserDynamic().bootstrapModule(AppModule);Scrolling beyond any particular rectangular area can be restricted by using the scrollableArea property of scroll settings. To restrict scrolling beyond any custom region, set the scrollLimit as “limited”. The following code example illustrates how to customize scrollable area.
import { Component, ViewEncapsulation, OnInit, ViewChild } from '@angular/core';
import { DiagramComponent, Diagram, NodeModel, ScrollSettingsModel } from '@syncfusion/ej2-angular-diagrams';
@Component({
selector: "app-container",
template: `<ejs-diagram #diagram id="diagram" width="100%" height="580px" [getNodeDefaults] ='getNodeDefaults' [scrollSettings]="scrollSettings">
<e-nodes>
<e-node id='node1' [offsetX]=150 [offsetY]=150>
</e-node>
</e-nodes>
</ejs-diagram>`,
encapsulation: ViewEncapsulation.None
})
export class AppComponent {
@ViewChild("diagram")
public diagram: DiagramComponent;
public scrollSettings: ScrollSettingsModel;
ngOnInit(): void {
// Defines the pageSettings for the diagram
this.scrollSettings = {
//Sets the scroll limit
scrollLimit: 'infinity',
//Sets the scrollable Area
scrollableArea: {
x: 0,
y: 0,
width: 500,
height: 500
}
}
}
public getNodeDefaults(node: NodeModel): NodeModel {
node.height = 100;
node.width = 100;
node.style.fill = "#6BA5D7";
node.style.strokeColor = "White";
return node;
}
}import { NgModule } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { AppComponent } from './app.component';
import { DiagramModule } from '@syncfusion/ej2-angular-diagrams';
/**
* Module
*/
@NgModule({
imports: [
BrowserModule, DiagramModule
],
declarations: [AppComponent],
bootstrap: [AppComponent],
providers: [ ]
})
export class AppModule { }import { platformBrowserDynamic } from '@angular/platform-browser-dynamic';
import { enableProdMode } from '@angular/core';
import { AppModule } from './app.module';
enableProdMode();
platformBrowserDynamic().bootstrapModule(AppModule);The updateViewPort method is used to update the diagram page and view size at runtime.