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LibHTML: Implement basic <form> and <input> element support

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This patch adds "submit" inputs and default (text box) inputs, as well
as form elements that can be submitted.

Layout of input elements is implemented via a new LayoutWidget class
that allows you to put an arbitrary GWidget in the layout tree.
At the moment, the DOM node sets the initial size of the LayoutWidget,
and then the positioning is done by the normal layout algorithm.

We also now support submitting a <form method="GET">, which does a full
replacing load with a URL based on the form's action + a query string
built from the name/value of input elements within the submitted form.

This is pretty neat! :^)
This commit is contained in:
Andreas Kling 2019-11-25 21:21:55 +01:00
parent a91c17c0eb
commit 6d1c4ae5a9
11 changed files with 229 additions and 0 deletions
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51
Libraries/LibHTML/DOM/HTMLInputElement.cpp Normal file
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#include <LibGUI/GButton.h>
#include <LibGUI/GTextBox.h>
#include <LibHTML/DOM/Document.h>
#include <LibHTML/DOM/HTMLFormElement.h>
#include <LibHTML/DOM/HTMLInputElement.h>
#include <LibHTML/Frame.h>
#include <LibHTML/HtmlView.h>
#include <LibHTML/Layout/LayoutWidget.h>
HTMLInputElement::HTMLInputElement(Document& document, const String& tag_name)
: HTMLElement(document, tag_name)
{
}
HTMLInputElement::~HTMLInputElement()
{
}
RefPtr<LayoutNode> HTMLInputElement::create_layout_node(const StyleProperties*) const
{
ASSERT(document().frame());
auto& frame = *document().frame();
ASSERT(frame.html_view());
auto& html_view = const_cast<HtmlView&>(*frame.html_view());
RefPtr<GWidget> widget;
if (type() == "submit") {
auto button = GButton::construct(value(), &html_view);
int text_width = Font::default_font().width(value());
button->set_relative_rect(0, 0, text_width + 20, 20);
button->on_click = [this](auto&) {
if (auto* form = first_ancestor_of_type<HTMLFormElement>()) {
// FIXME: Remove this const_cast once we have a non-const first_ancestor_of_type.
const_cast<HTMLFormElement*>(form)->submit();
}
};
widget = button;
} else {
auto text_box = GTextBox::construct(&html_view);
text_box->set_text(value());
text_box->on_change = [this] {
auto& widget = to<LayoutWidget>(layout_node())->widget();
const_cast<HTMLInputElement*>(this)->set_attribute("value", static_cast<const GTextBox&>(widget).text());
};
int text_width = Font::default_font().width(value());
text_box->set_relative_rect(0, 0, text_width + 20, 20);
widget = text_box;
}
return adopt(*new LayoutWidget(*this, *widget));
}