在ArkUI C++中實(shí)現(xiàn)自定義控件需要遵循以下步驟:
OHOS::UI::UIView
的自定義控件類。例如,我們創(chuàng)建一個(gè)名為MyCustomView
的類:#include "components/ui_view.h"
class MyCustomView : public OHOS::UIView {
public:
MyCustomView();
virtual ~MyCustomView();
// 重寫 UIView 的方法
void OnDraw(OHOS::Buffer* buffer) override;
};
MyCustomView
類。在這里,我們可以重寫OnDraw()
方法來自定義控件的繪制邏輯。#include "my_custom_view.h"
#include "common/graphic_startup.h"
#include "components/root_view.h"
#include "draw/draw_rect.h"
MyCustomView::MyCustomView() {
// 設(shè)置控件的寬高
SetWidth(200);
SetHeight(100);
}
MyCustomView::~MyCustomView() {
}
void MyCustomView::OnDraw(OHOS::Buffer* buffer) {
OHOS::UIView::OnDraw(buffer);
// 獲取繪制區(qū)域
OHOS::Rect rect = GetContentRect();
// 創(chuàng)建一個(gè)矩形繪制對(duì)象
OHOS::DrawRect drawRect;
drawRect.SetRect(rect);
// 設(shè)置繪制屬性
drawRect.SetColor(OHOS::Color::Red());
drawRect.SetStrokeWidth(5);
// 繪制矩形
drawRect.DrawToBuffer(buffer, *GetOrigRect(), *GetOrigRect());
}
main_ability_slice.cpp
文件中,你可以將MyCustomView
添加到根視圖:#include "main_ability_slice.h"
#include "my_custom_view.h"
void MainAbilitySlice::OnStart(const OHOS::Want& want) {
AbilitySlice::OnStart(want);
// 創(chuàng)建一個(gè) MyCustomView 實(shí)例
MyCustomView* myCustomView = new MyCustomView();
// 將 MyCustomView 添加到根視圖
OHOS::RootView* rootView = OHOS::RootView::GetInstance();
rootView->Add(myCustomView);
// 設(shè)置根視圖
SetUIContent(rootView);
}
現(xiàn)在,你已經(jīng)成功地在ArkUI C++中實(shí)現(xiàn)了一個(gè)自定義控件。你可以根據(jù)需要修改MyCustomView
類的OnDraw()
方法來自定義控件的外觀和行為。