ダウンロードしたタイル画像をオンザフライで描画する GRID/TILED Image View を実装したいと考えています。その中でピンチ/ズームやその他のタッチ操作を実行できるようにしたいです。たとえば、ビューをパンすると、新しいタイルが読み込まれ、ビューに完全または部分的に描画されます。既存の UI コントロールでそれを行う方法が見つかりませんでした。また、これらの既存の UI コントロールはサブクラス化できず、上書きする paint()/onDraw メソッド (Android のビュー/キャンバスなど) がありません。スクロールビューを使用したimageViewで問題を解決できる場合があります。他のオプションは、外部ウィンドウを使用している可能性があります。どちらの場合も、それらをどのように実装できるか、またはそれらのケースでジェスチャがどのように処理されるかはわかりません。または、それを行う他の方法があるかどうか。それを解決するための洞察を教えてください。
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10
リモートから画像を読み込む CustomImageView を作成し、その CustomImageView を GridListLayout を使用して ListView に配置します。ListItemProvider クラスを使用して、ListView をカスタマイズできます。以下に必要なすべてのクラスのコードを示します。
//main.qml
import bb.cascades 1.0
import my.library 1.0 //Custom library where CustomImageView and our ListProvider resides
Page {
content: ScrollView {
gestureHandlers: [
PinchHandler {
onPinchUpdated: {
scrollView.zoomToPoint(event.midPointX, event.midPointY, event.pinchRatio)
}
}
]
id: scrollView
scrollViewProperties {
scrollMode: ScrollMode.None
pinchToZoomEnabled: true
}
ListView {
overlapTouchPolicy: OverlapTouchPolicy.Allow
objectName: "listView"
layout: GridListLayout {
columnCount: 2
}
listItemProvider: CustomImageViewProvider { //Our list item provider
}
listItemComponents: [
ListItemComponent {
CustomImageView { //CustomImageView to load image from remote via internet
}
}
]
dataModel: XmlDataModel {
source: "model/path.xml"
}
}
}
}
//CustomImageView.cppインターネット経由でリモート ロケーションから画像を読み込むための CustomControl
CustomImageView::CustomImageView(Container *parent) :
CustomControl(parent) {
Container *contentContainer = new Container();
DockLayout *contentLayout = new DockLayout();
contentContainer->setLayout(contentLayout);
mItemImage = ImageView::create("");
mItemImage->setHorizontalAlignment(HorizontalAlignment::Fill);
mItemImage->setVerticalAlignment(VerticalAlignment::Fill);
contentContainer->add(mItemImage);
setRoot(contentContainer);
}
void CustomImageView::updateItem(const QString imagePath) {
WebServiceRequest *webServiceRequest = new WebServiceRequest(imagePath);
connect(webServiceRequest, SIGNAL(complete(QByteArray, bool)), this,
SLOT(onComplete(QByteArray, bool)));
webServiceRequest->getResponse();
}
void CustomImageView::onComplete(QByteArray data, bool success) {
if (success) {
mItemImage->setImage(Image(data));
mItemImage->setVisible(true);
} else {
qDebug() << "Request failed";
}
}
void CustomImageView::select(bool select) {
}
void CustomImageView::reset(bool selected, bool activated) {
mItemImage->setVisible(false);
}
void CustomImageView::activate(bool activate) {
}
//WebServiceRequest.cpp CustomImageViewがインターネット経由で画像のリクエストを送信するために使用するこのクラス
WebServiceRequest::WebServiceRequest(QString url) {
webServiceUrl = url;
}
WebServiceRequest::~WebServiceRequest() {
}
void WebServiceRequest::getResponse() {
QNetworkAccessManager* netManager = new QNetworkAccessManager();
if (!netManager) {
qDebug() << "Unable to create QNetworkAccessManager!";
emit complete("Unable to create QNetworkAccessManager!", false);
return;
}
QUrl url(webServiceUrl);
QNetworkRequest req(url);
QNetworkReply* ipReply = netManager->get(req);
connect(ipReply, SIGNAL(finished()), this, SLOT(onReply()));
}
void WebServiceRequest::onReply() {
QNetworkReply* reply = qobject_cast<QNetworkReply*>(sender());
QString response;
bool success = false;
if (reply) {
if (reply->error() == QNetworkReply::NoError) {
int available = reply->bytesAvailable();
if (available > 0) {
success = true;
emit complete(reply->readAll(), success);
}
} else {
response =
QString("Error: ") + reply->errorString()
+ QString(" status:")
+ reply->attribute(
QNetworkRequest::HttpStatusCodeAttribute).toString();
}
reply->deleteLater();
}
}
//CustomImageViewProvider.cppこれは、ListView をカスタマイズするために使用される ListItemProvider です。
CustomImageViewProvider::CustomImageViewProvider() {
}
VisualNode * CustomImageViewProvider::createItem(ListView* list,
const QString &type) {
CustomImageView *myCustomImageView = new CustomImageView();
return myCustomImageView;
}
void CustomImageViewProvider::updateItem(ListView* list,
bb::cascades::VisualNode *listItem, const QString &type,
const QVariantList &indexPath, const QVariant &data) {
QVariantMap map = data.value<QVariantMap>();
CustomImageView *myCustomImageView = static_cast<CustomImageView *>(listItem);
qDebug() << indexPath;
QString imagePath = map["path"].toString();
myCustomImageView->updateItem(imagePath);
}
コンストラクターで main.qml のルートを作成および設定する前に、CustomImageView および CustomImageViewProvider を qml に登録します。それらがqmlで利用できるように
qmlRegisterType < CustomImageView > ("my.library", 1, 0, "CustomImageView");
qmlRegisterType < CustomImageViewProvider > ("my.library", 1, 0, "CustomImageViewProvider");
// Path.xmlすべてのパスはこのファイルに保存され、リスト ビューで DataModel として使用されます
<root>
<image path="http://upload.wikimedia.org/wikipedia/commons/e/eb/A_landscape_in_Peradeniya,_Sri_Lanka.jpg"/>
<image path="http://lejournaldelaphotographie.com/system/photos/54840/med_fernando-brito_lost-in-the-landscape_1-jpg.jpg"/>
<image path="http://st.houzz.com/simgs/17713aee00b8b8b7_15-7678/modern-landscape.jpg"/>
<image path="http://cdn.c.photoshelter.com/img-get/I0000kRJbKDHBT30/s/900/720/Landscape-sunset-15.jpg"/>
<image path="http://www.cashmoredesign.com/images/large/landscape-5.jpg"/>
<image path="http://ad009cdnb.archdaily.net/wp-content/uploads/2012/11/50b7d0ddb3fc4b239a0000f2_arteology-atelier-37-2_-atelier37-2_arteologie-34-528x396.jpg"/>
<image path="http://upload.wikimedia.org/wikipedia/en/e/e8/Berchem,_Nicolaes_~_Landscape_with_Herdsmen_Gathering_Sticks,_early_1650s,_oil_on_panel,_private_collection,_New_York.jpg"/>
<image path="http://www.taschen.com/media/images/960/teaser_mi_arch_now_landscape_top_1203301047_id_536230.jpg"/>
<image path="http://lasersandlights.com/images/medium/landscape%20bliss%20spright.jpg"/>
<image path="http://uploads0.wikipaintings.org/images/pieter-bruegel-the-elder/landscape-with-the-flight-into-egypt-1563.jpg"/>
<image path="http://middo.me/wp-content/uploads/2012/07/Landscape-with-calm-river-1024x640.jpg"/>
<image path="http://ad009cdnb.archdaily.net/wp-content/uploads/2012/07/500de84928ba0d609d000038_fort-werk-aan-t-spoel-rietveld-landscape_rob6999kopierl-528x352.jpg"/>
<image path="http://upload.wikimedia.org/wikipedia/commons/e/eb/A_landscape_in_Peradeniya,_Sri_Lanka.jpg"/>
<image path="http://lejournaldelaphotographie.com/system/photos/54840/med_fernando-brito_lost-in-the-landscape_1-jpg.jpg"/>
<image path="http://st.houzz.com/simgs/17713aee00b8b8b7_15-7678/modern-landscape.jpg"/>
<image path="http://cdn.c.photoshelter.com/img-get/I0000kRJbKDHBT30/s/900/720/Landscape-sunset-15.jpg"/>
<image path="http://www.cashmoredesign.com/images/large/landscape-5.jpg"/>
<image path="http://ad009cdnb.archdaily.net/wp-content/uploads/2012/11/50b7d0ddb3fc4b239a0000f2_arteology-atelier-37-2_-atelier37-2_arteologie-34-528x396.jpg"/>
<image path="http://upload.wikimedia.org/wikipedia/en/e/e8/Berchem,_Nicolaes_~_Landscape_with_Herdsmen_Gathering_Sticks,_early_1650s,_oil_on_panel,_private_collection,_New_York.jpg"/>
<image path="http://www.taschen.com/media/images/960/teaser_mi_arch_now_landscape_top_1203301047_id_536230.jpg"/>
<image path="http://lasersandlights.com/images/medium/landscape%20bliss%20spright.jpg"/>
<image path="http://uploads0.wikipaintings.org/images/pieter-bruegel-the-elder/landscape-with-the-flight-into-egypt-1563.jpg"/>
<image path="http://middo.me/wp-content/uploads/2012/07/Landscape-with-calm-river-1024x640.jpg"/>
<image path="http://ad009cdnb.archdaily.net/wp-content/uploads/2012/07/500de84928ba0d609d000038_fort-werk-aan-t-spoel-rietveld-landscape_rob6999kopierl-528x352.jpg"/>
<image path="http://upload.wikimedia.org/wikipedia/commons/e/eb/A_landscape_in_Peradeniya,_Sri_Lanka.jpg"/>
<image path="http://lejournaldelaphotographie.com/system/photos/54840/med_fernando-brito_lost-in-the-landscape_1-jpg.jpg"/>
<image path="http://st.houzz.com/simgs/17713aee00b8b8b7_15-7678/modern-landscape.jpg"/>
<image path="http://cdn.c.photoshelter.com/img-get/I0000kRJbKDHBT30/s/900/720/Landscape-sunset-15.jpg"/>
<image path="http://www.cashmoredesign.com/images/large/landscape-5.jpg"/>
<image path="http://ad009cdnb.archdaily.net/wp-content/uploads/2012/11/50b7d0ddb3fc4b239a0000f2_arteology-atelier-37-2_-atelier37-2_arteologie-34-528x396.jpg"/>
<image path="http://upload.wikimedia.org/wikipedia/en/e/e8/Berchem,_Nicolaes_~_Landscape_with_Herdsmen_Gathering_Sticks,_early_1650s,_oil_on_panel,_private_collection,_New_York.jpg"/>
<image path="http://www.taschen.com/media/images/960/teaser_mi_arch_now_landscape_top_1203301047_id_536230.jpg"/>
<image path="http://lasersandlights.com/images/medium/landscape%20bliss%20spright.jpg"/>
<image path="http://uploads0.wikipaintings.org/images/pieter-bruegel-the-elder/landscape-with-the-flight-into-egypt-1563.jpg"/>
<image path="http://middo.me/wp-content/uploads/2012/07/Landscape-with-calm-river-1024x640.jpg"/>
<image path="http://ad009cdnb.archdaily.net/wp-content/uploads/2012/07/500de84928ba0d609d000038_fort-werk-aan-t-spoel-rietveld-landscape_rob6999kopierl-528x352.jpg"/>
<image path="http://upload.wikimedia.org/wikipedia/commons/e/eb/A_landscape_in_Peradeniya,_Sri_Lanka.jpg"/>
<image path="http://lejournaldelaphotographie.com/system/photos/54840/med_fernando-brito_lost-in-the-landscape_1-jpg.jpg"/>
<image path="http://st.houzz.com/simgs/17713aee00b8b8b7_15-7678/modern-landscape.jpg"/>
<image path="http://cdn.c.photoshelter.com/img-get/I0000kRJbKDHBT30/s/900/720/Landscape-sunset-15.jpg"/>
<image path="http://www.cashmoredesign.com/images/large/landscape-5.jpg"/>
<image path="http://ad009cdnb.archdaily.net/wp-content/uploads/2012/11/50b7d0ddb3fc4b239a0000f2_arteology-atelier-37-2_-atelier37-2_arteologie-34-528x396.jpg"/>
<image path="http://upload.wikimedia.org/wikipedia/en/e/e8/Berchem,_Nicolaes_~_Landscape_with_Herdsmen_Gathering_Sticks,_early_1650s,_oil_on_panel,_private_collection,_New_York.jpg"/>
<image path="http://www.taschen.com/media/images/960/teaser_mi_arch_now_landscape_top_1203301047_id_536230.jpg"/>
<image path="http://lasersandlights.com/images/medium/landscape%20bliss%20spright.jpg"/>
<image path="http://uploads0.wikipaintings.org/images/pieter-bruegel-the-elder/landscape-with-the-flight-into-egypt-1563.jpg"/>
<image path="http://middo.me/wp-content/uploads/2012/07/Landscape-with-calm-river-1024x640.jpg"/>
<image path="http://ad009cdnb.archdaily.net/wp-content/uploads/2012/07/500de84928ba0d609d000038_fort-werk-aan-t-spoel-rietveld-landscape_rob6999kopierl-528x352.jpg"/>
</root>
于 2012-12-28T12:21:22.900 に答える