Use a component to display image link previews

TODO.md

@@ -11,6 +11,7 @@
   - When qml syntax highlighting supports ES6 string interpolation, use them
 
 - Fixes
+  - Scroll to begin/end
   - `minutesBetween()` for 13:13:58 and 14:15:07
   - `# > quote` doesn't color
   - Pressing backspace in composer sometimes doesn't work
@@ -29,6 +30,7 @@
   - Verify big avatars aren't downloaded uselessly
 
 - UI
+  - Esc in sidepane to focus chat again
   - Set an explicit placeholder text color for text field/area
   - Change typing bar background
   - Show error if uploading avatar fails or file is corrupted
@@ -38,8 +40,8 @@
   - Message selection
     - Make scroll wheel usable
     - Copy to X11 selection
-    - Make events copiable
+  - Link previews
-    - Images don't load correctly in TextEdit
+    - Take the previews into account to calculate delegate min height
 
   - Just use Shortcut onHeld instead of analyzing the current velocity
     in `smartVerticalFlick()`

src/python/config_files.py

@@ -105,6 +105,7 @@ class UISettings(JSONConfigFile):
     async def default_data(self) -> JsonData:
         return {
             "alertOnMessageForMsec": 4000,
+            "messageImageMaxThumbnailSize": 256,
             "theme": "Default.qpl",
             "writeAliases": {},
             "keys": {

src/python/html_filter.py

@@ -1,7 +1,7 @@
 import re
 
 import mistune
-from lxml.html import HtmlElement, etree  # nosec
+from lxml.html import HtmlElement  # nosec
 
 import html_sanitizer.sanitizer as sanitizer
 from html_sanitizer.sanitizer import Sanitizer
@@ -66,39 +66,22 @@ class HtmlFilter:
         if outgoing:
             return html
 
-        tree = etree.fromstring(html, parser=etree.HTMLParser())
-
-        if tree is None:
-            return ""
-
-        for el in tree.iter("img"):
-            el = self._wrap_img_in_a(el)
-
-        for el in tree.iter("a"):
-            el = self._append_img_to_a(el)
-
-        result = b"".join((etree.tostring(el, encoding="utf-8")
-                           for el in tree[0].iterchildren()))
-
-        text = str(result, "utf-8").strip("\n")
-
         return re.sub(
             r"<(p|br/?)>(\s*&gt;.*)(!?</?(?:br|p)/?>)",
             r'<\1><span class="quote">\2</span>\3',
-            text,
+            html,
         )
 
 
     def sanitize_settings(self, inline: bool = False) -> dict:
         # https://matrix.org/docs/spec/client_server/latest#m-room-message-msgtypes
-        # TODO: mx-reply, audio, video, the new hidden thing
+        # TODO: mx-reply and the new hidden thing
 
         inline_tags = {"font", "a", "sup", "sub", "b", "i", "s", "u", "code"}
         tags        = inline_tags | {
             "h1", "h2", "h3", "h4", "h5", "h6","blockquote",
             "p", "ul", "ol", "li", "hr", "br",
-            "table", "thead", "tbody", "tr", "th", "td",
+            "table", "thead", "tbody", "tr", "th", "td", "pre",
-            "pre", "img",
         }
 
         inlines_attributes = {
@@ -107,7 +90,6 @@ class HtmlFilter:
             "code": {"class"},
         }
         attributes = {**inlines_attributes, **{
-            "img":  {"width", "height", "alt", "title", "src"},
             "ol":   {"start"},
             "hr":   {"width"},
         }}
@@ -115,7 +97,7 @@ class HtmlFilter:
         return {
             "tags": inline_tags if inline else tags,
             "attributes": inlines_attributes if inline else attributes,
-            "empty": {} if inline else {"hr", "br", "img"},
+            "empty": {} if inline else {"hr", "br"},
             "separate": {"a"} if inline else {
                 "a", "p", "li", "table", "tr", "th", "td", "br", "hr",
             },
@@ -139,6 +121,7 @@ class HtmlFilter:
                 sanitizer.tag_replacer("caption", "p"),
                 sanitizer.target_blank_noopener,
                 self._process_span_font,
+                self._img_to_a,
             ],
             "element_postprocessors": [],
             "is_mergeable": lambda e1, e2: e1.attrib == e2.attrib,
@@ -159,42 +142,13 @@ class HtmlFilter:
 
 
     @staticmethod
-    def _wrap_img_in_a(el: HtmlElement) -> HtmlElement:
+    def _img_to_a(el: HtmlElement) -> HtmlElement:
-        link   = el.attrib.get("src", "")
+        if el.tag == "img":
-        width  = el.attrib.get("width", "256")
-        height = el.attrib.get("height", "256")
-
-        if el.getparent().tag == "a" or el.tag != "img":
-            return el
-
             el.tag            = "a"
-        el.attrib.clear()
+            el.attrib["href"] = el.attrib.pop("src", "")
-        el.attrib["href"] = link
+            el.text           = el.attrib.pop("alt", None) or el.attrib["href"]
-        el.append(etree.Element("img", src=link, width=width, height=height))
+
         return el
 
 
-    def _append_img_to_a(self, el: HtmlElement) -> HtmlElement:
-        link = el.attrib.get("href", "")
-
-        if not (el.tag == "a" and self._is_image_path(link)):
-            return el
-
-        for _ in el.iter("img"):  # if the <a> already has an <img> child
-            return el
-
-        el.append(etree.Element("br"))
-        el.append(etree.Element("img", src=link, width="256", height="256"))
-        return el
-
-
-    @staticmethod
-    def _is_image_path(link: str) -> bool:
-        return bool(re.match(
-            r"(https?|s?ftp)://.+/.+\.(jpg|jpeg|png|gif|bmp|webp|tiff|svg)$",
-            link,
-            re.IGNORECASE,
-        ))
-
-
 HTML_FILTER = HtmlFilter()

src/python/models/items.py

@@ -2,6 +2,9 @@ import re
 from dataclasses import dataclass, field
 from datetime import datetime
 from typing import Any, Dict, List, Optional, Tuple
+from urllib.parse import urlparse
+
+import lxml  # nosec
 
 import nio
 
@@ -145,6 +148,27 @@ class Event(ModelItem):
     def event_type(self) -> str:
         return self.local_event_type or type(self.source).__name__
 
+    @property
+    def preview_links(self) -> List[Tuple[str, str]]:
+        if not self.content.strip():
+            return []
+
+        return [
+            (self._get_preview_type(link[0], link[2]), link[2])
+            for link in lxml.html.iterlinks(self.content)
+        ]
+
+    @staticmethod
+    def _get_preview_type(el: lxml.html.HtmlElement, link: str) -> str:
+        path = urlparse(link).path.lower()
+
+        for ext in ("jpg", "jpeg", "png", "gif", "bmp", "webp", "tiff", "svg"):
+            if el.tag == "img" or path.endswith(ext):
+                return "image"
+
+        return "page"
+
+
 
 @dataclass
 class Device(ModelItem):

src/qml/Base/HButton.qml

@@ -5,10 +5,10 @@ import QtQuick.Layouts 1.12
 Button {
     id: button
     spacing: theme.spacing
-    leftPadding: spacing / (circle ? 1.5 : 1)
-    rightPadding: leftPadding
     topPadding: spacing / (circle ? 1.75 : 1.5)
     bottomPadding: topPadding
+    leftPadding: spacing / (circle ? 1.5 : 1)
+    rightPadding: leftPadding
 
     iconItem.svgName: loading ? "hourglass" : icon.name
     icon.color: theme.icons.colorize

src/qml/Base/HImage.qml

@@ -3,6 +3,7 @@ import QtGraphicalEffects 1.12
 
 Image {
     id: image
+    autoTransform: true
     asynchronous: true
     cache: true
     fillMode: Image.PreserveAspectFit

src/qml/Chat/Timeline/EventContent.qml

@@ -7,7 +7,6 @@ Row {
     id: eventContent
     spacing: theme.spacing / 2
 
-
     readonly property string eventText: Utils.processedEventText(model)
     readonly property string eventTime: Utils.formatTime(model.date)
     readonly property int eventTimeSpaces: 2
@@ -29,8 +28,8 @@ Row {
     HoverHandler { id: hover }
 
     Item {
-        width: hideAvatar ? 0 : 48
+        width: hideAvatar ? 0 : 58
-        height: hideAvatar ? 0 : collapseAvatar ? 1 : smallAvatar ? 28 : 48
+        height: hideAvatar ? 0 : collapseAvatar ? 1 : smallAvatar ? 28 : 58
         opacity: hideAvatar || collapseAvatar ? 0 : 1
         visible: width > 0
 
@@ -39,8 +38,8 @@ Row {
             userId: model.sender_id
             displayName: model.sender_name
             avatarUrl: model.sender_avatar
-            width: hideAvatar ? 0 : 48
+            width: hideAvatar ? 0 : 58
-            height: hideAvatar ? 0 : collapseAvatar ? 1 : 48
+            height: hideAvatar ? 0 : collapseAvatar ? 1 : 58
         }
     }
 
@@ -55,15 +54,18 @@ Row {
             theme.fontSize.normal * 0.5 * 75,  // 600 with 16px font
             Math.max(
                 nameLabel.visible ? nameLabel.implicitWidth : 0,
-                contentLabel.implicitWidth
+                contentLabel.implicitWidth,
             )
         )
-        height: (nameLabel.visible ? nameLabel.height : 0) +
+        height: childrenRect.height
-                contentLabel.implicitHeight
         y: parent.height / 2 - height / 2
 
         Column {
-            anchors.fill: parent
+            id: mainColumn
+            width: parent.width
+            spacing: theme.spacing / 1.75
+            topPadding: theme.spacing / 1.75
+            bottomPadding: topPadding
 
             HSelectableLabel {
                 id: nameLabel
@@ -71,6 +73,8 @@ Row {
                 visible: ! hideNameLine
                 container: selectableLabelContainer
                 selectable: ! unselectableNameLine
+                leftPadding: eventContent.spacing
+                rightPadding: leftPadding
 
                 // This is +0.1 and content is +0 instead of the opposite,
                 // because the eventList is reversed
@@ -81,10 +85,6 @@ Row {
                 // elide: Text.ElideRight
                 horizontalAlignment: onRight ? Text.AlignRight : Text.AlignLeft
 
-                leftPadding: theme.spacing
-                rightPadding: leftPadding
-                topPadding: theme.spacing / 2
-
                 function selectAllTextPlus() {
                     contentLabel.selectAllTextPlus()
                 }
@@ -97,6 +97,10 @@ Row {
                 width: parent.width
                 container: selectableLabelContainer
                 index: model.index
+                leftPadding: eventContent.spacing
+                rightPadding: leftPadding
+                bottomPadding: previewLinksRepeater.count > 0 ?
+                               mainColumn.bottomPadding : 0
 
                 text: theme.chat.message.styleInclude +
                       eventContent.eventText +
@@ -115,12 +119,6 @@ Row {
                 wrapMode: Text.Wrap
                 textFormat: Text.RichText
 
-                leftPadding: theme.spacing
-                rightPadding: leftPadding
-                topPadding: nameLabel.visible ? 0 : bottomPadding
-                bottomPadding: theme.spacing / 2
-
-
                 function selectAllText() {
                     // Select the message body without the date or name
                     container.clearSelection()
@@ -142,6 +140,22 @@ Row {
 
                 HoverHandler { id: contentHover }
             }
+
+            Repeater {
+                id: previewLinksRepeater
+                model: previewLinks
+
+                HLoader {
+                    Component.onCompleted: {
+                        if (modelData[0] == "image") {
+                            setSource(
+                                "EventImage.qml",
+                                { source: modelData[1] },
+                            )
+                        }
+                    }
+                }
+            }
         }
     }
 }

src/qml/Chat/Timeline/EventDelegate.qml

@@ -1,9 +1,19 @@
 import QtQuick 2.12
 import QtQuick.Layouts 1.12
 import "../../Base"
+import "../../utils.js" as Utils
 
 Column {
     id: eventDelegate
+    width: eventList.width
+
+    topPadding:
+        model.event_type == "RoomCreateEvent" ? 0 :
+        dayBreak  ? theme.spacing * 4 :
+        talkBreak ? theme.spacing * 6 :
+        combine   ? theme.spacing / 2 :
+        theme.spacing * 2
+
 
     // Remember timeline goes from newest message at index 0 to oldest
     property var previousItem: eventList.model.get(model.index + 1)
@@ -38,14 +48,9 @@ Column {
     readonly property bool unselectableNameLine:
         hideNameLine && ! (onRight && ! combine)
 
-    width: eventList.width
+    readonly property var previewLinks: model.preview_links
 
-    topPadding:
+    property string hoveredImage: ""
-        model.event_type == "RoomCreateEvent" ? 0 :
-        dayBreak  ? theme.spacing * 4 :
-        talkBreak ? theme.spacing * 6 :
-        combine   ? theme.spacing / 2 :
-        theme.spacing * 2
 
 
     Daybreak {
@@ -71,14 +76,7 @@ Column {
         acceptedButtons: Qt.RightButton
         onTapped: {
             contextMenu.link  = eventContent.hoveredLink
-            contextMenu.popup()
+            contextMenu.image = eventDelegate.hoveredImage
-        }
-    }
-
-    TapHandler {
-        acceptedButtons: Qt.LeftButton | Qt.RightButton
-        onLongPressed: {
-            contextMenu.link = eventContent.hoveredLink
             contextMenu.popup()
         }
     }
@@ -87,8 +85,17 @@ Column {
         id: contextMenu
 
         property string link: ""
+        property string image: ""
 
-        onClosed: link = ""
+        onClosed: { link = ""; image = "" }
+
+        HMenuItem {
+            id: copyImage
+            icon.name: "copy-link"
+            text: qsTr("Copy image address")
+            visible: Boolean(contextMenu.image)
+            onTriggered: Utils.copyToClipboard(contextMenu.image)
+        }
 
         HMenuItem {
             id: copyLink
@@ -101,12 +108,25 @@ Column {
         HMenuItem {
             icon.name: "copy-text"
             text: qsTr("Copy text")
-            visible: enabled || ! copyLink.visible
+            visible: enabled || (! copyLink.visible && ! copyImage.visible)
             enabled: Boolean(selectableLabelContainer.joinedSelection)
             onTriggered:
                 Utils.copyToClipboard(selectableLabelContainer.joinedSelection)
         }
 
+        HMenuItem {
+            icon.name: "settings"
+            text: qsTr("Print event item")
+            visible: debugMode
+            onTriggered: print(JSON.stringify(Utils.getItem(
+                modelSources[[
+                    "Event", chatPage.userId, chatPage.roomId
+                ]],
+                "client_id",
+                model.client_id
+            ), null, 4))
+        }
+
         HMenuItem {
             icon.name: "settings"
             text: qsTr("Set as debug console target")

src/qml/Chat/Timeline/EventImage.qml

@@ -0,0 +1,31 @@
+import QtQuick 2.12
+import "../../Base"
+
+HImage {
+    id: image
+    x: eventContent.spacing
+    sourceSize.width: maxDimension
+    sourceSize.height: maxDimension
+    width: Math.min(
+        mainColumn.width - eventContent.spacing * 2,
+        implicitWidth,
+        maxDimension,
+    )
+
+    property int maxDimension: window.settings.messageImageMaxThumbnailSize
+
+    TapHandler {
+        onTapped: Qt.openUrlExternally(image.source)
+    }
+
+    HoverHandler {
+        id: hover
+        onHoveredChanged: eventDelegate.hoveredImage = hovered ? image.source : ""
+    }
+
+    MouseArea {
+        anchors.fill: image
+        acceptedButtons: Qt.NoButton
+        cursorShape: Qt.PointingHandCursor
+    }
+}

src/qml/Chat/Timeline/EventList.qml

@@ -177,7 +177,7 @@ Rectangle {
     }
 
     HNoticePage {
-        text: qsTr("No messages visible yet.")
+        text: qsTr("No messages visible yet")
 
         visible: eventList.model.count < 1
         anchors.fill: parent